Wednesday

February 10, 2016
Number of results: 1,226

**Math Stats**

Help me solve this please. One of the few on my hw list that I had no idea how to solve A medical researcher is interested in the prenatal care received by pregnant women in inner cities. She interviews 35 randomly selected women with children on the streets of Baltimore and ...
*October 8, 2014 by Somi *

**Stats**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 24, 2011 by Jennifer*

**Can u help me Ms. Sue...Stats**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 25, 2011 by Jennifer*

**Stats**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 25, 2011 by Jen*

**stats**

A random sample of mid-sized cars tested for fuel consumption gave a mean of miles per gallon with a standard deviation of miles per gallon. Assuming that the miles per gallon given by all mid-sized cars have a normal distribution, find a confidence interval for the population...
*April 9, 2014 by Anonymous*

**Stats**

the director of an insurance companies computing center estimates that the companies computer has a 20% chance of catching a computer virus. However they feel that there is only a 6% chance of the computers catching a virus that will completely disable the operating system. If...
*February 23, 2007 by Jason L*

**PLZ help!! Stats....**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 25, 2011 by Jennifer*

**Can u plz help me PsyDag?? Stats**

In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this mild...
*October 25, 2011 by Jennifer*

**Did i do this right??? STATS**

3. In testing a new drug, researchers found that 10% of all patients using it will have a mild side effect. A random sample of 14 patients using the drug is selected. Find the probability that: (A) exactly two will have this mild side effect (B) at least three will have this ...
*October 26, 2011 by Jen*

**Stats**

1. The question asks to choose a data point in our graph (we chose 476,44) of median home prices (x) and percentage of students who scored Advanced on math MCAS (y). We have to find the residual. I'm confused because the equation I was given is e=y-yhat I know one is the ...
*March 18, 2013 by Jill*

**Stats**

1. The question asks to choose a data point in our graph (we chose 476,44) of median home prices (x) and percentage of students who scored Advanced on math MCAS (y). We have to find the residual. I'm confused because the equation I was given is e=y-yhat I know one is the ...
*March 19, 2013 by Jill*

**Stats help**

A poll conducted in 1972 asked 1003 people, " During the past year, about how many books did you read either all or part of the way through?" Results of the survey indicated that x-bar=18.9 books and s=1 9.9 books. A)Construct a 95% confidence interval for the mean number of ...
*May 5, 2013 by Megan*

**Stats help**

A poll conducted in 1972 asked 1003 people, " During the past year, about how many books did you read either all or part of the way through?" Results of the survey indicated that x-bar=18.9 books and s=1 9.9 books. A)Construct a 95% confidence interval for the mean number of ...
*May 5, 2013 by Megan*

**stats**

the p-value for a significance test is .0358. a correct interpretation of this p-value would be: a) about 3.6% of the data are significant b) about 3.6% of all samples are significant c) about 3.6% of all samples would produce a test statistic at least as extreme as ours if ...
*April 28, 2009 by Stephanie*

**stats**

A multiple choice test consists of four questions. Each question has five possible answers of which only one is correct. A student guesses on every question. Find the probability distribution of X, the number of questions she answers correctly. A) x P(X = x) 0 0 1 0.2 2 0.04 3...
*July 10, 2015 by Lupe*

**Math & Stats**

Please help I was up till 2am trying to figure this out last night, Thanks The top selling Red and Voss is rated 70,000 miles, which means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles...
*February 11, 2011 by Tiffany*

**stats**

A clothing company employs 36 workers on first shift and 19 workers on second shift. Five workers are chosen at random to be interviewed about the work environment. Find the probability of choose: a) All first-shift workers b) all second-shift workers c) six first-shift ...
*February 10, 2013 by Kristi*

**Stats**

Suppose you have a standard deck 52 cards (4 suits: hearts, diamonds, clubs, and spades each suit has 13 cards (1/4 of the deck) and those 13 cards include one ace,and numbers 2 through 10 and 3 face cards: a jack a queen and king) suppose you pick a card at randome and then ...
*March 10, 2013 by Anonymous*

**STATS. PLease help **

The time for an emergency medical squad to arrive at the sports center at the edge of a particular town is normally distributed with mean 17 minutes and standard deviation 3 minutes. What is the probability that it will take the medical squad more than 22 minutes to arrive at ...
*February 1, 2011 by Ryan*

**Stats **

According to a Louis Harris poll, 63% of male drivers always use seat belts. A recent sample of 900 male drivers showed that 60% of them always use seat belts. Test at the 0.01 lovel of significance if the proportion of male drivers who always use seat belts is less than .63.
*November 14, 2013 by Justin *

**Stats**

A test has 15 true or false questions and 10 multiple choice questions (each with 4 choices). All questions are weighted equally. Jack has not studied at all for the test and randomly guesses. 1. What is the probability that Jack gets 96% on the test? a. 0.000000001 b. 0....
*October 23, 2010 by Rhea *

**Stats **

Assume that event A occurs with probability 0.4 and event B occurs with probability 0.5. Assume that A and B are disjoint events. The probability that either event occurs (A or B) is A. 0.0 B. 0.7 C. 0.9 D. 1.0.
*March 29, 2014 by Tracy *

**Statistics**

This is my first stats class and I don't know how to do this, could you please help me? Thank you. You are asked to determine the typical number of sales of a certain product at the store you work for. A sample of 50 days over the last quarter shows an average of 55 units sold...
*October 31, 2011 by Melvin*

**Math Stats**

Suppose that a random sample of n kernels of popcorn is taken and x of these kernels pop. The buyer wants to be 95% sure that the point estimate for p will be within 0.01.If no preliminary study is done to estimate p, how large a sample should the buyer use? If a preliminary ...
*March 28, 2012 by Apryl*

**Stats/ Probability **

Repeated die toss experiment. A fair die is tossed repeatedly, and the sequence of numbers that turn up is recorded, until a 1 is obtained. When a 1 is obtained, the experiment is over, but the 1 is included in the sequence. Thus every outcome is a sequence of integers ending ...
*September 29, 2013 by denim*

**Stats**

The manager of Lone Star Restaurant believes that the average wait time of the Saturday evening meal is 30 minutes. To test this belief, the manager selects 50 customers at random and computes the average wait time to be 34 minutes. Assume a population standard deviation of 12...
*November 9, 2015 by Lucy*

**Stats**

Many colleges and universities hold a “blood drive” for organizations such as the Red Cross. To help with the planning of an upcoming blood drive, we want to estimate the proportion, p, of students and faculty who would be willing to donate a pint of blood. The Red Cross would...
*November 28, 2012 by Matt*

**Stats**

Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean $\var{mu}$ litres and standard deviation $\var{sigma}$ litres. a) What is the probability that the mean daily water intake for a random...
*June 5, 2015 by Hui*

**stats (please help)**

I need help determining what x and y is in this question. A psychologist has constructed a paper and pencil test purported to measure depression. To see how the test compares with the ratings of the expert, 12 emotionally disturbed individual are given the paper and pencil ...
*April 2, 2009 by Lou*

**stats**

salary study conducted. mean for men = $42,000. Std deviation = $9,000. mean for women = $39,000. Std dev for women = 8,000. If 100 men surveyed, at a CI of 95% what is the the most number of women surveyed if there was no Statistical difference in the mean for men and women?
*April 26, 2011 by Julia*

**Physics**

If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes sense to include ...
*January 6, 2010 by Kate*

**Physics**

If I wanted to right SIGMA F = ma in the proper notation what would I put above and below SIGMA Would I put a lower case "n" above SIGMA and "i = 0" below it and then put a subscript "i" under the "F" thank you I have been woundering about this as it makes sense to include ...
*January 6, 2010 by Kate*

**Stats**

A company with two plants producing the same product, but with two slightly different manufacturing processes, conducted a sample study at each of the two plants with the following results: The sample statistics from the first group are: n = 40, x-bar = 18, s = 4.2. The sample...
*November 13, 2013 by Cam*

**Stats**

5. A person’s blood glucose level and diabetes are closely. X is a random variable that measures the milligrams of glucose per deciliter of blood. After a 12 hour fast, x has an approximate normal distribution with a mean of 85 and a standard deviation of 25. What is the ...
*June 7, 2014 by Mark Riverside*

**maths stats**

For each day of the 5-day working week Tom can choose any one of 6 newspapers to read at the lunchtime. (i) How many different choices are possible in a week? (ii) If Tom wants to read a different title each day, then how many different choices are possible in a week?
*December 23, 2012 by tom*

**stats**

a test consists of 25 multiple choice questions. Each has 5 possible answers, which only one is correct. If a student guesses on each question, find the following: a) prob that he will guess all of them right b)prob that he will guess at most 12 right c) prob that he will ...
*February 18, 2011 by gio*

**stats**

Info given:With a random sample of 9 men. let X denote the number of men with head circumference larger than 57.8cm. the normal mean=56cm and standard dev=1.8cm. So this is a binomal dis- they ask; For X, calculate pr(X=2)? second part, Let X denote the number of men with HC ...
*April 15, 2010 by UPD*

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...
*March 12, 2013 by kelly*

**stats**

Which test should be used one samples t test, independent samples t test or dependent samples t test You may have heard that eating salt can influence people’s weight. Assume that the normal weight of 20-year-old females is 150 pounds. You obtain a sample of 20-year-old ...
*March 12, 2013 by kelly*

**Business stats**

I have just started business school and am struggling with this HW problem. any help would be great!!...A certain type of new business succeeds 60% of the time. Suppose that 3 such businesses open (where they do not compete so its reasonable to believe that their relative ...
*April 14, 2009 by bob*

**Stats**

A random sample of n=500 households in a certain metropolitan area revealed that 150 have combined cable, phone and internet service. a.Calculate p-hat, the sample proportion of households having such service. b.Calculate a confidence interval for π, the proportion of all...
*April 21, 2012 by sam*

**stats**

Data on number of days of work missed and annual salary increase for a company's employees show that in general exployees who missed more days of work during the year received smaller raises than those who missed fewer days. A detailed analysis showed that number of days ...
*March 11, 2009 by james*

**stats**

Data on number of days of work missed and annual salary increase for a company's employees show that in general exployees who missed more days of work during the year received smaller raises than those who missed fewer days. A detailed analysis showed that number of days ...
*March 11, 2009 by james*

**statistics**

Looking for help with some of my stats homework, I got parts of it but then hit a brink wall. Any help would be welcome. A recruiter estimates that if you are hired to work for her company and you put in a full week at the commissioned sales representative position she is ...
*November 1, 2010 by Valerie*

**Stats**

You want to rent an unfurnished one-bedroom apartment in Boston next year. The mean monthly rent for a random sample of 14 apartments advertised in the local newspaper is $1200. Assume that the standard deviation is $230. Find a 95% confidence interval for the mean monthly ...
*July 9, 2012 by James*

**Statistics**

In an Intro Stats class, 57% of students eat breakfast in the morning and 80% of students floss their teeth. Forty-six percent of students eat breakfast and also floss their teeth. What is the probability that a student from this class eats breakfast given they floss their ...
*October 4, 2013 by Larry*

**MATH (STATS)**

To determine the views of a students on a particular campus about fraternities, an 11-point attitude scale was administered to a random sample of 40 students. This survey yielded a sample mean of 6 (the higher the score, the more favorable the view of the fraternities) and a ...
*October 8, 2014 by Taylor*

**math stats**

Set up the null and alternative hypothesis for the following problem. A survey reported the planning habits of men and women. The question asked, "how do you primarily keep track of meetings, appointments and deadlines?" 56% of men and 46% of women answered, "in my head." Let ...
*June 22, 2013 by jerry*

**Stats**

The time for an emergency medical squad to arrive at the sports center at the edge of a particular town is normally distributed with mean 17 minutes and standard deviation 3 minutes. What is the probability that it will take the medical squad more than 22 minutes to arrive at ...
*February 1, 2011 by Ryan*

**Stats**

The time for an emergency medical squad to arrive at the sports center at the edge of a particular town is normally distributed with mean 17 minutes and standard deviation 3 minutes. What is the probability that it will take the medical squad more than 22 minutes to arrive at ...
*February 1, 2011 by Ryan*

**Stats **

The distribution of lifetimes for a particular brand of lightbulbs has a mean of 110 hours and a standard deviation of 20 hours. Suppose a random sample of 35 lightbulbs is taken for observation. What is the probability that the sample mean lifetime will be between 105 and 115...
*January 31, 2011 by Ryan*

**Stats**

Instructions for the Experiment / Data Collection regarding questions 1-4: Collect data regarding the caffeine content in a 16oz cup of coffee. Collect the amount of caffeine in 20 different brands of coffee. 1.Calculate the following descriptive statistics corresponding to ...
*April 19, 2015 by Nisa (Please Help me)*

**stats**

In testing a new drug, researchers found that 1% of all patients using it will have a mild side effect. A random sample of 12 patients using the drug is selected. Find the probability that: (A) exactly one will have this mild side effect (B) at least one will have this mild ...
*November 23, 2011 by tina*

**stats**

2. A standardized exam was provided to all 3rd graders in Arizona schools. The average score was 75 with a standard deviation of 10. Assuming that the scores were normally distributed, answer the following questions. (a) What z-score corresponds with a score of 75? (b) What z-...
*July 26, 2012 by taylor quenzler*

**Stats**

1. In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1-10. The data appear below. Number of Cups of Coffee Stress Level 3 5 2 3 4 3 6 9 5 4 1 2 7 10 3 5 = 3.88 X= 5.13 s = 2.03 s = 2.90 ...
*June 22, 2013 by Dee*

**stats**

On a test of motor coordination, the population of average bowlers has a mean score of 24, with a standard deviation of 6. A random sample of 30 bowlers at Fred's Bowling Alley has a sample mean of 26. A second random sample of 30 bowlers at Ethel's Bowling Alley has a mean of...
*February 8, 2015 by lisa*

**Stats and Data**

Suppose that either of two instruments might be used for making a certain measurement. Instrument 1 yields a measurement whose p.d.f. is f1(x)=2x, 0 <x<1 Instrument 2 yields a measurement whose p.d.f. is f2(x)=3x^2, 0 <x<1 Suppose that one of the two instruments is...
*December 2, 2010 by Salman*

**proofread chemistry**

write the formulas for the following compounds Sodium chlorate i put NaCl Lead (II) phosphate i put Pb2P For Magnesium hydrogen carbonate i had no clue! then it stats state the number of electrons lost or gained in forming each of these Ions. I didnt understand the question ...
*March 8, 2008 by John*

**STATS**

Samples of both surface soil and subsoil were taken from eight randomly selected farms in a county. The soil samples were analyzed to determine both surface pH and subsoil pH, which yielded the following results: Farm 1 2 3 4 Surface pH: 6.55 5.98 5.59 6.17 Subsoil pH: 6.78 6....
*February 22, 2011 by Rina*

**Stats**

Suppose that 8% of a certain batch of calculators have a defective case, and that 11% have defective batteries. Also, 3% have both a defective case and defective batteries. A calculator is selected from the batch at random. Find the probability that the calculator has a good ...
*October 26, 2010 by Tatjana*

**Stats**

Suppose that 8% of a certain batch of calculators have a defective case, and that 11% have defective batteries. Also, 3% have both a defective case and defective batteries. A calculator is selected from the batch at random. Find the probability that the calculator has a good ...
*October 26, 2010 by Tatjana*

**stats**

Continuous Random Variable, I Let X be a random number between 0 and 1 produced by the idealized uniform random number generator described. Find the following probabilities: a.P(0less than or equal to X less than or equal to 0.4) b.P(0.4 less than or equal to X less than or ...
*March 18, 2009 by chris*

**ap stats**

Continuous Random Variable, I Let X be a random number between 0 and 1 produced by the idealized uniform random number generator described. Find the following probabilities: a.P(0less than or equal to X less than or equal to 0.4) b.P(0.4 less than or equal to X less than or ...
*March 18, 2009 by jaz*

**Stats**

Skewed distributions were discussed in this week’s readings. Think about some of the psychological studies you are familiar with and the constructs investigated in those studies. Describe the study you are referring to and give some examples of the variables from the study ...
*February 18, 2011 by Sheryl*

**stats**

3. The mean family income in Arizona is about $64,750 with a standard deviation (for the population) of $59,750. Imagine that you are taking a sample of 200 randomly selected state residents. (a) What is the probability that your sample mean is between $61,000 and $64,750? (b...
*July 26, 2012 by taylor quenzler*

**Stats**

I. Use Chebyshev’s theorem to find what percent of the values will fall between 183 and 227 for a data set with a mean of 205 and standard deviation of 11. II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of 297 ...
*October 15, 2011 by Jennifer*

**Stats**

Four diners have ordered a platter of desserts. The platter holds 8 chocolate chip cookies and 4 slices of chocolate cheesecake. The waiter gives each diner a randomly selected dessert. Let Y = the number of slices of cheesecake left on the platter after the first serving. The...
*March 10, 2015 by Anonymous*

**Stats. **

Another one that I need help.... At Ajax Spring Water, a half-liter bottle of soft drink is supposed to contain a mean of 520 ml. The filling process follows a normal distribution with a known process standard deviation of 4 ml. (a) Which sampling distribution would you use if...
*April 23, 2014 by Lindsay *

**stats**

The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to estimate the average diameter of these pipes. A random sample of 18 pipes produces an average diameter of 2.56 mm with a standard deviation of 0.05 mm. The average diameter ...
*November 27, 2012 by johnny *

**Stats**

In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the mean crash damages the same for...
*August 4, 2008 by T*

**STATS**

Scientists wish to test the mind-readiing ability of a person who claims to have ESP. They use five cards with different and distinctive symbols( square, cicrle, triangle, line, squiggle). Someone picks a card at random and thinks about the symbol. The mind-reader must ...
*October 17, 2011 by JONATHAN*

**7 STATS MATHGURU PLEASE HELP**

A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99%confidence assuming s=17.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How ...
*May 5, 2013 by Megan*

**stats**

since the stock market began in 1872, stock prices have risen in about 73% of the years. Assuming that market performance is independent from year to year, what's the probability that a) the market will rise 3 consecutive years? b) the market will rise 3 years out of the next ...
*May 11, 2010 by Anonymous*

**AP Stats**

I generally know how to use the normalcdf function on my calculator, but how to I find the area under a normal curve if there is no lower limit or no upper limit? For instance, we are required to use a calculator on this problem: Find the area under the standard normal curve ...
*September 13, 2010 by Emily*

**Stats**

A student hands each of 300 classmates 2 chocolates side by side on a plate. Of the 300 students, 171 choose the chocolate that¢s on their right hand side, and the remaining 129 choose the chocolate that¢s on their left. The student says, “That¢s just like tossing a coin...
*July 29, 2013 by Help please!!!*

**stats**

One company produces movie trailers with mean 150 seconds and standard deviation 40 seconds, while a second company produces movie trailers with mean 120 seconds and standard deviation 30 seconds. What is the probability that two randomly selected trailers, one produced by ...
*January 22, 2016 by kelly*

**Statistics**

I'm taking stats online which is making it even more difficult for me and I have nowhere to begin when answering this question. 1. A pharmaceutical industry claimed that their new product will lower the cholesterol level by an average of 14.5. To verify the claim, a laboratory...
*June 22, 2014 by Michelle*

**Stats HELP PLEASE**

The game of Yahtzee is played with five fair six-sided dice. A turn consists of rolling all five dice, selecting the ones you want to keep, re-rolling the rest, and then doing this one more time, if necessary. You need to match certain conditions in order to score points. (For...
*October 28, 2009 by CM*

**Stats**

A sample of 27 blue M&Ms has a mean weight of 0.8560 grams. Assume that is known to be 0.0565 g. Consider a hypothesis test that uses a 0.05 significance level to test the claim that the mean weight of all M&Ms is equal to 0.8535 grams (the weight necessary so that bags of M&...
*April 24, 2009 by Jennifer*

**stats**

A company that manufactures and bottles apple juice has a machine that automatically fills 16-ounce bottles. There is some variation, however, in the exact amount of juice dispensed into each bottle. From a large number of observations taken over a long period of time, it was ...
*January 29, 2011 by a*

**Stats**

I need help with this problem for school. For the first one i got .3758 and second 1.6, but i don't think they are right. My calculations are off It is known that about 20% of car insurance policies include emergency road service. Suppose we randomly select 10 car insurance ...
*February 16, 2011 by John*

**stats**

Question 5 of 10 Why are partial regression coefficients necessary in multiple regression? (Points : 1) Multiple variables each provide some of the same information. Each variable involved contributes a unique error component. Each variable involved is part of the intercept ...
*July 20, 2014 by please help*

**Stats for Psychology**

Not sure how to rewrite this question: ht tp://img221. imageshack.us/ img221/601/question2. jpg Get rid of all the spaces to see image of question: Delete the space between ht and tp delete the space between 221. and imageshack delete the space between us/ and img delete the ...
*March 27, 2012 by Arianna*

**Stats**

The amount of time Ricardo spends brushing his teeth follows a Normal Distribution with unknown mean and standard deviation. Ricardo spends less than one minute brushing his teeth about 40% of the time. He spends more than two minutes brushing his teeth 2% of the time. Use ...
*October 9, 2008 by Ann*

**Stats Class HELP!**

Twenty-five blood samples were selected by taking every seventh blood sample from racks holding 187 blood samples from the morning draw at a medical center. The white blood count (WBC) was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard ...
*April 18, 2014 by Katie*

**Math**

I'm really stuck on these STATS questions.Can someone please help! 1. The probability of a car in a population having faulty brakes is .05. If we take a sample of 150 cars, find the standard deviation of the sampling distribution. 2. The strength of ten I-beams produced in a ...
*June 20, 2013 by mysterychicken*

**Statistics**

For the gene pair that determines eye color, each gene trait may be one of two types: dominant brown (B) or recessive blue (b). A person possessing the gene pair BB or Bb has brown eyes, whereas the pair bb produces blue eyes. a) Suppose both parents of an individual are Bb. ...
*May 25, 2009 by Kate*

**stats**

Usin7) An employer polled its employers to see if they agree with the proposed new store hours and whether or not their present shift made a difference in their answers. The customers answered 1 for agree, 2 for don't know, and 3 for disagree. Nine first shift employees ...
*June 15, 2013 by cam*

**Stats**

For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 I. What score was earned by more students than any other ...
*October 18, 2011 by Jen*

**Stats**

For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 57 Third quartile = 87 Standard deviation = 9 Range = 51 Mean = 72 Median = 72 Mode = 98 Midrange = 57 I. What score was earned by more students than any other ...
*October 19, 2011 by Jen*

**probs & stats**

A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6. She did not give the other 200 students a study guide and their average score was 70 with a standard deviation of 8. Find the critical value to determine whether ...
*May 11, 2015 by adrenning*

**Stats 330- HELP **

I need some help on this question it has two parts but i can't figure it out. Can someone help me. The NDSU library checks out an average of 320 books per day, with a standard deviation of 75 books. Suppose a simple random sample of 30 days is selected for observation. What is...
*March 10, 2011 by John*

**Stats for managers**

3-100 Matthews, Young and Associates, a Chapel Hill consulting firm, has these records indicating the number of days each of its ten staff consultants billed last year: 212 320 230 210 229 231 219 221 222 a)Without computing the value of any of these measures, which of them ...
*February 6, 2011 by Anonymous*

**Stats**

To compare the durabilities of two paints for highway use, 12 four-inch wide lines of each paint were laid down across a heavily-traveled road. The order was decided at random. After a period of time, reflectometer readings were obtained for each line. The higher the reading, ...
*November 25, 2009 by Desire*

**Statistics**

A certian company enjoyed 3.5% profits in year 1 over its revenue in Year 0. In Year 2, it enjoyed 5.75% profits over Year 1. In Year 3, it posted 1.25% profits over Year 2. What single, constant profit over this period of years would have produced the same profit? The teacher...
*May 3, 2011 by Ben*

**stats **

Relatively speaking, which statistics exam did you do better on? On your first statistics exam you scored a 72 and on the second exam you scored an 89. Hey, you’re improving! Or are you? On the first exam, the class mean was 71 with a standard deviation of 15. On the second ...
*February 5, 2013 by kelly*

**Statistics**

2. Obtain and interpret descriptive statistics (Mean, Median, Variance, and Std. Dev.). Include the STATA outputs in your results. (Use Stat command “tabstat crimerat police59, statistics(mean, p50, var, sd)” (3 pts) . tabstat crimerat police59,statistics (mean, p50, var, sd) ...
*November 8, 2011 by Mikey*

**Stats**

A study found that for adults the general self-efficacy scale mean score was 35 and standard deviation was 12. A group of clients (n=14) was measured for their general self-efficacy with the same measure and found having 40 with standard deviation of 20. A group of therapist ...
*August 17, 2013 by Mark*

**stats (please help)**

Assume that the population of heights of male college students is approximately normally distributed with mean of 69 inches and standard deviation of 3.75 inches. Show all work. (A) Find the proportion of male college students whose height is greater than 70 ...
*July 21, 2011 by Celest*

**Stats**

Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of 17 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can assume that the weights...
*March 16, 2014 by Alexus*