Monday

October 24, 2016
Number of results: 1,327

**Stats**

Studies show that 38% of all women suffer from hip fractures caused by osteoporosis by age 85. If 6 women aged 85 are randomly selected, what is the probability that A) None will suffer or has suffered a hip fracture P(x = 0) B) At least 4 have suffered a hip fracture P(x ¡Ü 4...

*January 23, 2010 by Sunny*

**Stats**

A classroom of n = 10 children has a mean score of 17.200 on a measure of hyperactivity. One new child is added to the class, and the mean hyperactivity score for the resulting classroom including all the children is 18.000. Find the value of the new child's hyperactivity ...

*January 31, 2015 by Luis*

**Stats (Finance)**

Given the following information: Year X Y Z 2004 12.53 2.64 -4.65 2005 6.25 4.67 16.78 2006 -9.62 -3.50 13.46 2007 -12.99 -6.89 10.43 2008 26.84 13.56 -3.56 A. Calculate the average rate of return for each of X, Y, Z for the period 2004-2008. B. Calculate the expected rate of ...

*March 18, 2009 by Helpmeplease*

**Stats**

Approximately 5% of children develop chronic bronchitis in the first year of life. In a group of 20 children, find the probability that exactly 2 of them develop chronic bronchitis in the first year of life.

*June 5, 2014 by Farah*

**Easy Stats ?**

You decide to flip a fair coin 100 times. What is the variance of this distribution? Also You decide to flip a fair coin 100 times. What is the standard deviation of this distribution?

*September 21, 2015 by Dnice *

**Stats**

estimate the probability that a patient has health insurance, if 59% of Americans have private insurance and 25% have government insurance. Estimate the probability that it is private insurance Is this P(A and B) = P(A) x P(B)

*September 27, 2015 by Christina*

**Stats**

An instructor gives a test with 20 multiple choice questions. There are 4 responses per questions and only one choice correct. The test also has 30 True/False questions. Determine the probability a student randomly guessing on all questions and correctly answering no more than...

*March 31, 2011 by Lacey*

**Business Stats**

In a recent survey in a Statistics class, it was determined that only 60% of the students attend class on Fridays. From past data it was noted that 98% of those who went to class on Fridays pass the course, while only 20% of those who did not go to class on Fridays passed the ...

*March 13, 2013 by Jada*

**stats**

A researcher investgating depression devises a study that contains the independent variable "Treatment," manipulated between-participants. Participants may experience "psychodynamic therapy," "cognitive behavioral therapy," "medication," or "waiting list placement." How many ...

*March 1, 2009 by ash*

**stats ?**

A researcher investgating depression devises a study that contains the independent variable "Treatment," manipulated between-participants. Participants may experience "psychodynamic therapy," "cognitive behavioral therapy," "medication," or "waiting list placement." How many ...

*March 2, 2009 by ash*

**stats**

In a poll of 100 adults, 45% reported they believed in faith healing. (USA Today, 20 April 1998). Based on this survey, a 95% confidence interval for the proportion in the population who believe in faith healing is about 42% to 48%. If this poll had been based instead on ...

*June 23, 2010 by Anonymous*

**stats**

Between 11 P.M. and midnight on Thursday night, Mystery Pizza gets an average of 5.7 telephone orders per hour. a) Find the probability that at least 32 minutes will elapse before the next telephone order. b) Find the probability that less than 17 minutes will elapse. c) Find ...

*October 31, 2010 by anonymous*

**Stats- Two-tailed test**

A researcher is conducting a matched-pairs study. She gathers data on each pair in the study resulting in the table below. Assume that the data are normally distributed in the population. Pair Group1 Group2 1 10 12 2 8 9 3 11 11 4 8 10 5 9 12 a) At 10% level of significance ...

*June 12, 2011 by Thara*

**Stats**

Cans of regular Coke are labeled as containing 12. Statistics students weighted the content of 10 randomly chosen cans, and found the mean weight to be 12.1. Assume that cans of Coke are filled so that the actual amounts are normally distributed with a mean of 12 and a ...

*October 20, 2012 by S*

**stats**

You pick 2 M&Ms from a large bag. What is the probability that 1) at least one is brown? 2) not all are blue? brown=13% yellow=14% red=13% blue=24% orange=20% green=16% 1) P(at least one M&M is brown) = 1 - P(no M&M is brown) = 1 - (0.87) = 0.13 Is this correct? 2) P(not all M...

*October 14, 2009 by CM*

**stats**

(a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The distribution is Normal because the standard deviation is ...

*September 26, 2016 by Anonymous*

**stats**

(a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The distribution is Normal because the standard deviation is ...

*September 26, 2016 by Anonymous*

**Stats**

Determine the following random variables discrete or continuous: a)Number of fish I caught during 2 hours? I said: discrete b)Temperature of a coffee cup? I said: continuous c)Height of a 2-year-old maple tree? I said: continuous d) Number of credit cards I have in my wallet? ...

*February 8, 2014 by Ashley*

**stats.**

In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of the people in the city are children.) The study also stated that the standard deviation s was 0.123. Find a 95 % confidence interval for the true mean ...

*April 4, 2013 by chris*

**STATS**

The top selling Red and Voss tire is rated 70,000 miles 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 and a standard deviation of 6,400. a. What is the probability that a tire ...

*September 16, 2011 by SANDRA*

**stats**

A jar contains 7 black balls and 25 red balls. You take 2 out without replacing them. Find a)the probability of drawing 2 red balls in a row, b) the probability of drawing a red ball, then a black ball, c) the probability that the two balls will be of different colors

*December 18, 2014 by Sally*

**Stats**

Harley-Davidson motorcycles make up 14% of all the motorcycles registered in the United States. You plan to interview an SRS of 600 motorcycle owners. a.) What is the sampling distribution of the proportion of your sample who own Harley's? b.) How likely is your sample to ...

*November 9, 2011 by Manda*

**Algebra 2: Prob and Stats**

A survey of 480 high school students found that 37% had a pet. Find the margin of error. Round to the nearest percent. Use the margin of error to find an interval that is likely to contain the true population proportion. * margin of error = +-5% interval, 37% to 42% * margin ...

*May 24, 2010 by Skye*

**Stats**

Suppose that a random sample of adults has a mean score of on a standardized personality test, with a standard deviation of . (A higher score indicates a more personable participant.) If we assume that scores on this test are normally distributed, find a confidence interval ...

*November 19, 2011 by Anonymous*

**NEED HELP PLZ!!! STATS**

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed...

*October 23, 2011 by Jennifer*

**stats**

Jim is a randomly chosen member of a large population in which 6% are heroin users. Joe tests positive for heroin in a drug test that correctly identifies users 98% of the time and correctly identifies nonusers 95% of the time. What is the probability that Jim is a heroin user...

*February 4, 2016 by kinga*

**stats**

In the transmission of digital information, the probability that a bit has high, moderate, and low distortion is 0.01, 0.04, and 0.95, respectively. Suppose that three bits are transmitted and that the amount of distortion of each bit is assumed to be independent. Let X and Y ...

*October 31, 2014 by sam*

**Biology and Graphing (Stats)**

i need to make a graph on excel.. my data involve putting goldfish (from the same tank and same type) into 3 different environments : acidic, neutral (control), and basic. What kind of graph should I use? just a line graph? but then what should my variables look like? the 3 ...

*March 24, 2010 by Carter*

**stats**

A researcher conducted an experiment on the effects of a new drug on depression. The researcher had a control group that received nothing, a placebo group and an experimental group that received the drug. A depression inventory that provided a measure of depression on a 50...

*February 17, 2014 by brandi*

**Stats**

Three cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of tens drawn in a set of 3 cards. (A) If this experiment is completed without replacement, explain why x is not a binomial random variable. (B) If this experiment is completed...

*October 23, 2011 by Jennifer*

**Stats**

the typical saturday the oil change facility will perform 40 oil changes between 10 am and 12pm. treating this as a random sample, what mean oil change time would there be a 10% chance of being at or below? There is a 10% chance of being at or below a mean oil change time of ...

*April 21, 2014 by Sandra*

**stats**

The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the null hypothesis that Ï = 0 in favor of Ï 0 at ¿ = .05? (Give your answers ...

*October 30, 2013 by sarah*

**stats**

In order to improve the English speaking and reasing skills of their students, Jack Box Elementary assigns students whose native language is Spanish to a bilingual program for 8 week. To test the effectiveness of this program, then also need a control condition, in which the ...

*March 1, 2009 by ash*

**stats ?**

In order to improve the English speaking and reasing skills of their students, Jack Box Elementary assigns students whose native language is Spanish to a bilingual program for 8 week. To test the effectiveness of this program, then also need a control condition, in which the ...

*March 2, 2009 by ash*

**ap stats**

all students in a pe class completed a basketball free throw shooting event and the highest number of shots made was 32. the next day a student who had transferred into the school completed the event, making 35 shots. indicate whether adding the new student's score to the rest...

*August 29, 2012 by ash*

**stats.**

The GMAT test is required for admission to most graduate programs in business. In a recent year, the GMAT test scores were normally distributed with a mean of 550 and standard deviation of 100. A. Find the first quartile for the distribution of GMAT scores. B. Find the median ...

*March 18, 2013 by Christina*

**Stats**

There are 21,000 students in a MOOC. Each student tests the fairness of a coin (yes, the same coin; the instructor somehow gets Tyche¢s help in getting the coin to each student in turn). Specifically, each student tests: Null: p is equal to 0.5 Alternative: p is not equal to 0...

*July 31, 2013 by I need help..*

**Stats**

Find the number z (± 0.01) such that the proportion of observations that are less than z in a standard Normal distribution is 0.8 Find the number z (± 0.01) such that 59% of all observations from a standard Normal distribution are greater than z

*May 26, 2012 by Brittany*

**Stats**

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 persons. Further more, there is a weight limit of 2500 pounds. Assume the average weight of students, faculty and staff on campus is 150 pounds, the standard devaiton is 27 ...

*March 26, 2012 by Jane*

**Stats**

nformation given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question -the prob that HC of a random chosen man is larger than 57.8cm is? Work: pr(x)>57.8cm z=(57.8-56)=1.8--->.9641 i got it wrong...

*April 15, 2010 by UPD*

**MATH STATS**

For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The general population of ...

*July 4, 2011 by Vanessa*

**stats**

The percent of fat calories that a person that in America consumes each day is normallydistributed with a mean of 36 and a standard deviation of 10. Suppose that 16 individuals are randomly chosen for an experiment. 1. Completely describe the distribution of sample means for ...

*April 28, 2013 by Kayla*

**stats**

In a given situation, suppose H0 (null hypothesis) was not rejected at alpha= .02. Would H0 also be retained at alpha = .01? would H0 also be retained at alpha = .05? I'm thinking yes and can't tell. I agree If you did not reject Ho at P = .02, You would definitely not reject ...

*March 30, 2007 by nick*

**Stats**

The lifetime of a particular type of battery is normally distributed with a mean of 1100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to a departmental store. (a) What is the mean and standard deviation ...

*June 5, 2008 by Dherain*

**Stats**

A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 and 900 hours? a. 95 percent...

*December 13, 2011 by Stephanie F*

**STATS**

Inferences about Two Proportions technique (Chapter 9): There is a claim that proportion of successes increased in 2009 compare to 2008. For data given in Table 1 Table 1 Number of cases Number of successes 2008 400 180 2009 500 235 Calculate pooled sample proportion and z-...

*March 30, 2010 by Mary*

**STATS**

The vice-president of a business firm has reviewed the records of the firm's personnel and found that 70% of the employees read The Wall Street Journal. If the vice president was to choose 12 employees at random, what is the probability that the number of these employees who ...

*February 27, 2012 by tim*

**STATS**

Using the z-score of ±1.645 for the 5 percent cutoff and the z-score of ±1.96 for the 2.5 percent in the tail, identify the subject identification (ID) number for subjects who are closest to the cutoff for the upper 2.5 percent and 5 percent of the scores and the lower 2.5 ...

*January 12, 2016 by Slomo*

**Stats**

The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the null hypothesis that ρ = 0 in favor of ρ ≠ 0 at α = .05? (...

*November 12, 2014 by Rustie*

**Stats**

A random sample of 100 GMAT scores has a mean of 500. Assume that GMAT scores have a population standard deviation of 120. Construct a 95% confidence interval estimate of the mean GMAT scores. (15 pts) What is the sample size for the conference interval? What is the point ...

*October 12, 2014 by Lynn*

**stats**

A random sample of 50 households in community A has a mean household income of X =Rs. 44,600 with a standard deviation s =Rs. 2,200. A random sample of 50 households in community B has a mean of X = Rs. 43,800 with a standard deviation of Rs. 2,800. Estimate the dierence in...

*June 20, 2014 by Anonymous*

**STATS**

HumanPower, the temporary employment agency, has tested many peoples data entry skills. InfoTech needs a data entry person, and the person needs to be not only quick but also consistent. HumanPower pulls the speed records for 4 employees with the data given below in terms of ...

*February 6, 2011 by Anonymous*

**Stats**

a teacher teaches two sections (A and B) of a class. Both sections have a mean score of 75. Section A only has 5 students and they all received a score of 75, while section B has 15 students with a mean score of 75 with a variance of 12. What is the standard deviation of the ...

*May 28, 2008 by Andrea*

**stats**

write a brief paragraph addressing the question. Which is more likely, that a person is killed by lightning, or that a person is killed by lightning while playing golf in a thunderstorm? I believe it would be while playing golf due to holding the metal golf club, acting as a ...

*October 14, 2009 by CM*

**college stats**

can someone please explain the steps: suppose that the grade point average,denoted by X,of a university student is Normally distributed with the mean 2.786 and standard deviation 0.375 A). a student is on the deans list if her GPA exceeds 3.746. What percent of the students ...

*October 1, 2012 by damon*

**stats**

You are a travel agent and wish to estimate, with 95% confidence, the proportion of vacationers who plan to travel outside the United States in the next 12 months. Your estimate must be accurate within 3% of the true proportion Find the minimum sample size needed, using a ...

*November 13, 2012 by Anonymous*

**Stats **

The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the petals is 0.2 cm wider ...

*March 28, 2013 by Judy*

**Stats **

The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the petals is 0.2 cm wider ...

*March 28, 2013 by Judy*

**stats**

20. The sponsor of a local soccer tournament is responsible for writing an article for the local paper announcing the 151, 2nd, and3rdplacewinners. If10teamsareinvitedtothe tournament, and the sponsor wanted to get the article written in advance so it can go out in the next ...

*February 26, 2012 by tim*

**ap stats**

Based on historical data, an Oregon university enrolls 17% graduates and 83% undergraduates. Of graduates, 21% are expected to be non-residents and 79% are residents. Of undergraduates, 24% are non-residents and 76% are residents. During the 2008-2009 academic year, assume ...

*May 13, 2014 by emma*

**Stats**

Suppose that you are in a class of 31 students and it is assumed that approximately 10% of the population is left-handed. (Give your answers correct to three decimal places.) (a) Compute the probability that exactly five students are left-handed. (b) Compute the probability ...

*February 16, 2014 by Kay*

**Stats**

I am working on a review sheet and got everything except for this one. I am not sure whether to use z or t. The number of hours per week that high school juniors watch TV is normally distributed with a mean of 8 hours and a standard deviation of 2 hours. If 100 students are ...

*May 21, 2014 by Joe*

**College Stats**

A machine fills 64 ounce detergent jugs. It is known that the net amount of detergent poured into each jug has a normal distribution with a standard deviation of 0.35 ounces. The inspector wants to adjust the machine such that at least 95% of the jugs have more than 64 ounces ...

*October 28, 2008 by Riley*

**Stats**

A random sample of dates taken from headstones at a cemetery in Pleasanton, California, showed an average lifespan of 70 years with a standard deviation of 20 years. Assuming the distribution is unimodal, which of the following is most likely a good description of the ...

*October 9, 2011 by Anonymous*

**Stats**

Tonya wants to estimate what proportion of the students in her dormitory like the dorm food. She interviews an SRS of 50 of the 175 students living in the dormitory. She finds that 14 think the dorm food is good. a.) What population does Tonya want to draw conclusions about? ...

*November 9, 2011 by Manda*

**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 flosses his/her teeth given they eat ...

*October 1, 2013 by Lisa*

**stats**

Homeowners claim that the mean speed of automobiles traveling on their street is greater than the speed limit of 35 miles per hour. A random sample of 120 automobiles has a mean speed of 37 miles per hour and a standard deviation of 4 miles per hour. Using a significance level...

*April 9, 2016 by Anonymous*

**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*

**stats**

A play contains 15 speaking roles, 10 of them female and 5 male. If the director can choose among 16 female actors and 9 male actors to fill the roles, how many different casts are possible? (NOTE: A cast includes BOTH the actor AND the role that they play.) I'm just confused ...

*February 10, 2016 by McKinsley*

**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**

Anita's a fast food chain specializing in hotdogs and garlic fries, keeps track of the proportion of its customers who decide to eat in the restaurant so it can make decisions reguarding possible construction of the in-store play areas.the attendance of its mascot Stacy at the...

*October 1, 2016 by Riley*

**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*

**stats**

1. Conduct a hypothesis test for the following scenario. SHOW ALL YOUR WORK THE WAY WE DID IN CLASS! A coffee-dispensing machine is supposed to deliver 12 ounces of liquid into a large paper cup, but the costumer believes that the actual amount is less. As a test he plans to ...

*May 10, 2016 by Anonymous*