Sunday

July 24, 2016
**Statistics**

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours
*Monday, January 12, 2015 by Michael*

**statistics**

Can you explain how to do this problem The following is a list of 11 measurements: 72, 28, 56, -47, -36, -41, 21, -31, -56, 41, -54 . Suppose that these 11 measurements are respectively labeled x1, x2,...x11 . (Thus,72 is labeled x1 ,28 is labeled x2 and so on.) Find 11 looks ...
*Monday, January 12, 2015 by mary ann*

**Statistics**

Can someone help me with this question. I am so very confused. Find the y-intercept of the line whose equation is y=0.7x +6.2. could the answer be 5
*Monday, January 12, 2015 by mary ann*

**Statistics **

Did you ever buy an incandescent light bulb that failed (either burned out or did not work) the first time you turned the switch on? When you put a new light bulb into a light fixture, you expect it to light and most of the time it does. Consider 8-packs of 60-watt bulbs and ...
*Monday, January 12, 2015 by Jenny*

**Statistics **

The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's home pages is ...
*Monday, January 12, 2015 by Jenny*

**Statistics **

A company that produces rivets used by commercial aircraft manufactures knows that the shearing strength (force required to breaking) of its rivets is a major concern. The company believes the shearing strength of its rivets is normally distributed with a mean of 925 lbs and a...
*Monday, January 12, 2015 by Jenny*

**statistics**

One of nature's patterns connects the percent of adult birds in a colony that return from the previous year and the number of new adults that join the colony. Following are data for 13 colonies of sparrowhawks: Percent return 73 61 79 54 75 62 53 46 57 50 62 45 35 New ...
*Sunday, January 11, 2015 by Les*

**College Algebra**

According to data from the National Vital Statistics Report, the marriage rate (marriages per 1000) can be described by y=-0.146x+11.074, where x is the number of years after 1980. For what years does this model indicate that the marriage rate was above 9 marriages per 1000? ...
*Thursday, January 8, 2015 by Math Sucks*

**Psychological Statistics **

For a population with a mean of 80 and a standard deviation of 12, what is the Z score corresponding to an individual score of 92
*Wednesday, January 7, 2015 by Anonymous*

**Vocabulary Studies**

Building and construction A. Architecture B. Engineering C. Nursing D. Statistics I think it might be A?
*Tuesday, January 6, 2015 by Bryanna*

**Statistics**

Evaluate the following. 20 divide 5+8+2x4 Thank you
*Monday, January 5, 2015 by Mary Ann *

**Statistics**

The records of a computer retail store show that out of the 100 customers who purchased a desktop computer last month, 69 also purchased a service plan that extends the warranty for an extra year. Out of the 25 customers who purchased a notebook computer last month, 20 ...
*Monday, January 5, 2015 by Mary Ann*

**Statistics**

If someone could help with this problem so I can understand how to perform the actions. In the past year, Carmen watched 51 movies that she thought were very good. She watched 60 movies over the whole year. Of the movies she watched, what percentage did she think were very ...
*Monday, January 5, 2015 by Mary Ann*

**Statistics**

[(15-8)x3-13]divide 2
*Monday, January 5, 2015 by Mary Ann*

**probability and statistics**

a certain university in the region has a population of 20000 students distributed into 15 courses and four year levels.if you would like to determine the sample size, what technique can be applied
*Sunday, January 4, 2015 by fin*

**Statistics**

A filing machine designed to fill soda bottles with 16 ouncesof soda. The distribution for the weight of the bottles is normal. Twenty bottles are selected and weighted. The sample mean is 15.3 ounces and the standard deviation is 1.5 ounces . Develop a 90% confidence interval...
*Saturday, January 3, 2015 by Leslie Meagan*

**Statistics**

There are 300 students enrolled in Business Statics . Historically,exam scores are normally distributedwith a standard deviation of 30.9. Your instructor randomly selected a sample of 30 examinations and finds a mean of 74.2. Determine a 90% confidence interval for the mean ...
*Saturday, January 3, 2015 by Leslie Meagan*

**Statistics**

A firm claims that only 10% of it's accounts receivables are over 30 days past due. The bank that supplies working capital or interim laons to the fimrs is suspect of the figure and accordingly takes a random samole of 100 accounts of the firm. Find the probability that ...
*Saturday, January 3, 2015 by Leslie Meagan*

**Statistics**

The age of customers for a particular retail store follows a normal distribution with a mean of 37.5 years and a standard deviation of7.6 years.What is the probability that the next customer who enters the store will be less than 42 years old?
*Saturday, January 3, 2015 by Leslie Meagan*

**Statistics**

In 2000,the average charge of tax preparation was $95.Assuming a normal distibution and standard deviation of $10.What proportion of tax preparation fees were more than $95?
*Saturday, January 3, 2015 by Leslie Meagan*

**Math/ Statistics**

The owner of a football team claims that the average attendance at home games is over 3000, and he is therefore justified in moving the team to a city with a larger stadium. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to ...
*Tuesday, December 30, 2014 by breeamberr*

**Math/ Statistics**

A consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the null and alternative hypotheses for the test described. A. H0: µ = 16 ounces Ha: µ < 16 ounces B. H0: µ &...
*Tuesday, December 30, 2014 by breeamberr*

**Math/ Statistics**

z = 1.8 for Ha: µ > claimed value. What is the P-value for the test? A. 0.9641 B. 3.59 C. 96.41 D. 0.0359
*Tuesday, December 30, 2014 by breeamberr*

**math**

Describe a situation this week when you used math to solve a problem involving data, graphs and statistics.
*Monday, December 29, 2014 by Anonymous*

**statistics**

There were 50 men and 50 women who were randomly selected from a larger population. •A t-test was conducted to compare men and women’s performance on an assessment after eating chocolate. The results showed an independent t-test value of t .05(99) = 3.43; p < ....
*Monday, December 29, 2014 by Diana*

**statistics**

A jar contains 7 red balls, 5 green balls, 4 blue balls, and 3 white balls. A sample of size 7 balls is selected at random without replacement . Find t the probability that sample contains two red balls, 2 green balls, 2 blue balls, and 1 white ball.
*Friday, December 26, 2014 by kp*

**statistics**

interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of . The psychologist randomly selects children from this group and finds that their mean IQ score is . Based on this sample, find a confidence ...
*Sunday, December 21, 2014 by Anonymous*

**statistics**

Write a correct alternative hypothesis for the claim that the average professional basketball player is at least 6’ 9” tall.
*Friday, December 19, 2014 by Anonymous*

**statistics**

An IQ test was administered to a random sample of 26 mental patients and the mean was found to be 99.7. For this test, the population values are known to be normally distributed and with a population standard deviation of 15. Construct a 90% confidence interval for the mean IQ...
*Thursday, December 18, 2014 by Anonymous*

**statistics**

find the area under the curve y=3log1.2x between x = 1.2 and x = 3
*Thursday, December 18, 2014 by joel*

**Statistics**

What is the difference between normal distribution and approximate normally. Correct me if im wrong but I think the parameters of Normal is X~Normal (mu, standard deviation) but then approx. normal is X~Normal (mu, variation) im just really confused when you use each and such.
*Thursday, December 18, 2014 by Sarah*

**Statistics**

In the past, the mean running time for a certain type of flashlight battery has been 8.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The ...
*Wednesday, December 17, 2014 by Justice*

**statistics HELP!**

A data set includes body temperatures of healthy adult humans for which 98.1F and s= 0.56F. What is the best point estimate of the mean body temperature of all healthy humans? Using the sample statistics, construct a confidence interval estimate of the mean body temperature of...
*Tuesday, December 16, 2014 by Jenny*

**Statistics**

Consumption of alcoholic beverages by young women of drinking age has been increasing in the United Kingdom, the United States, and Europe (The Wall Street Journal, February 15, 2006). Data (annual consumption in liters) consistent with the findings reported in The Wall Street...
*Tuesday, December 16, 2014 by Jackie*

**statistics**

There are three brands of milk for sale in a supermarket. Let's call them brand A, B, and C. A customer who purchases milk will choose brands A,B, and C with probability 0.6, 0.3, 0.1, respectively. Each day, the toal number of customers who purchase milk at this market ...
*Sunday, December 14, 2014 by MH*

**statistics**

In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 3.8 and...
*Saturday, December 13, 2014 by Jenny*

**statistics**

A survey found that women's heights are normally distributed with mean 63.5 in. and standard deviation 2.3 in. The survey also found that men's heights are normally distributed with a mean 68.7 in. and a standard deviation 2.8. (a) Most of the live characters at an ...
*Saturday, December 13, 2014 by Kelli*

**Statistics**

Use Bayes' theorem to solve this problem. A storeowner purchases stereos from two companies. From Company A, 550 stereos are purchased and 1% are found to be defective. From Company B, 850 stereos are purchased and 6% are found to be defective. Given that a stereo is ...
*Friday, December 12, 2014 by Debbie*

**statistics finding the shaded region**

Find the area of the shaded region. The graph depicts the IQ score of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. The shaded region numbers are 85-120
*Thursday, December 11, 2014 by Kelli*

**statistics probability**

Assume that the thermometer readings are normally distributed with a mean of 0 degrees C and a standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. The probability of getting a reading between -1.39 degrees C and 1.69 degrees C is ____
*Thursday, December 11, 2014 by Jenn*

**statistics**

The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?
*Wednesday, December 10, 2014 by ann*

**statistics**

candidate #2 received 32% of the votes and candiate #3 received 14% of the votes, WITH a 6 % margin of error. what does this information tell us about the popularity of the candidates? 5
*Wednesday, December 10, 2014 by Denise*

**Statistics**

why is this sentence false. a statistic is an event computed from a population.
*Wednesday, December 10, 2014 by adriana*

**Statistics **

Hello Can you help me It is reported that 72% of working women use computers at work , choose 4 working wonen at random . Find the probability taht : A : all 4 use a computer at their work B : at least one does not use a computer at work Please help me 😞
*Tuesday, December 9, 2014 by Rehab*

**Statistics**

A card is selected at random from a standard deck of cards. Find the probability of randomly selecting a king given that an ace has already been selected.
*Tuesday, December 9, 2014 by Monica*

**Statistics**

An ice cream store offers 10 toppings. If no topping is used more than once, in how many different ways can a four topping ice cream dessert be formed?
*Tuesday, December 9, 2014 by Monica*

**fuctions and statistics**

one foot is equivalent to approximately 0.3048 meters. if a building is 65-feet long, what is the length of the building in meters, to the nearest tenth?
*Tuesday, December 9, 2014 by stephanie*

**Basic Statistics**

The math grades on the final exam varied greatly. Using the scores below, how many scores were within one standard deviation of the mean? How many scores were within two standard deviations of the mean? 99 34 86 57 73 85 91 93 46 96 88 79 68 85 89
*Tuesday, December 9, 2014 by Ann*

**statistics**

Suppose you have information that the average stress score of students in online universities is 13.15. Using Minitab, compute a one-sample t-test to find out whether the stress scores reported by your sample are significantly different from those of the population of online ...
*Tuesday, December 9, 2014 by edna*

**Statistics and Probability**

Mallory has a credit score of 680 and she is offered and interest rate of 8.3%. is this a good offer? Explain your answer.
*Monday, December 8, 2014 by Kristin*

**statistics**

The HIM department has 200,000 active medical records and the department received 12,081 records requests during the year. The QI indicator of the HIM department is Eighty-five percent of records requests will be located within 15 minutes. Of the 12,081 records in the question...
*Sunday, December 7, 2014 by Anonymous*

**statistics**

the hospital paper filing system contained 20,890 records. A total of 456 were identified as misfiled. What is the filing accuracy rate for the system? What is the percentage of misfiled records?
*Sunday, December 7, 2014 by Anonymous*

**statistics**

1)According to past record the average daily sales for a sporting goods store was $3456.00. After a new advertising campaign, the manager wants to see if the average daily sales have changed. A random sample of 20 days gives a sample mean of 3655 with a standard deviation of $...
*Saturday, December 6, 2014 by Bobby*

**Help with Statistics (T-value and decision rule)**

For a random sample of 12 observations, the sample mean was 407 and the standard deviation was 6. Using the .05 significant level, answer the following questions. What would the t value be? What is the decision rule? **** I think the t-value would be t = -3.0845 Any help would...
*Friday, December 5, 2014 by Jennifer*

**statistics**

Let x denote the time taken to run a road race. Suppose x is approximately normally distributed with a mean of 190 minutes and a standard deviation of 21 minutes. If one runner is selected at random, what is the probability that this runner will complete this road race in 225 ...
*Friday, December 5, 2014 by Eddie*

**statistics**

A politician claims that she will receive 66% of the vote in an upcoming election. The results of a properly designed random sample of 145 voters showed that 80 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.01 level of significance? ...
*Thursday, December 4, 2014 by Err*

**statistics**

A class has 100 students, 70 of which are boys. 70% of the boys are involved in sports, while 40% of the girls are involved in sports. A student is chosen at random. If the student chosen is a boy, what is the probability that he is involved in sports?
*Wednesday, December 3, 2014 by Kaylan*

**Ashworth College**

A study of students taking Statistics 101 was done. Four hundred students who studied for more than 10 hours averaged a B. Two hundred students who studied for less than 10 hours averaged a C. This difference was significant at the 0.01 level. What does this mean?
*Wednesday, December 3, 2014 by justice*

**Statistics**

A study of students taking Statistics 101 was done. Four hundred students who studied for more than 10 hours averaged a B. Two hundred students who studied for less than 10 hours averaged a C. This difference was significant at the 0.01 level. What does this mean?
*Wednesday, December 3, 2014 by justice*

**Statistics**

The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 90% of students now own a cell phone and 10% do not own a cell phone. Fifteen students are to be ...
*Wednesday, December 3, 2014 by Mackenzie *

**Statistics **

1.A sample of 25 bottles is taken from the production line at a local bottling plant. Assume that the fill amounts follow a normal distribution. The probability is 90% that the sample variance is less than what percent of the population variance? 2. The amount of money spent ...
*Wednesday, December 3, 2014 by abidjan*

**statistics**

Suppose an experiment consists of rolling a fair, six-sided number cube. What is the expected value of evens?
*Wednesday, December 3, 2014 by Regina*

**Statistics**

Assume that a procedure yields a binomial distribution with n=3 trials and a probability of success of p= 0.90. Use a binomial probability table to find the probability that the number of successes x is exactly 1.
*Tuesday, December 2, 2014 by Angel*

**Statistics**

Four pairs of data yield r=0.942 and the regression equation y-hat=3x. Also, y-bar=12.75. What is the best predicted value for x=4.3? I know that the answer is 12.5, but how do you know to use the y-bar value instead of plugging the x value into the equation?
*Tuesday, December 2, 2014 by Stella*

**Statistics**

The lifetimes of projector bulbs of a particular type are normally distributed with a mean of 470 hours and a standard deviation of 15 hours. What percentage of the bulbs has lifetimes that lie within 2 standard deviations of the mean on either side?
*Tuesday, December 2, 2014 by justice*

**Statistics**

At one college, GPA’s are normally distributed with a mean of 2.9 and a standard deviation of 0.6. Find the 70th percentile.
*Tuesday, December 2, 2014 by justice*

**Statistics**

The lifetimes of projector bulbs of a particular type are normally distributed with a mean of 470 hours and a standard deviation of 15 hours. What percentage of the bulbs has lifetimes that lie within 2 standard deviations of the mean on either side? Apply the 68-95-99.7 rule ...
*Tuesday, December 2, 2014 by Justice*

**Statistics**

A popular resort hotel has 300 rooms and is usually fully booked. About 4% of the time a reservation is cancelled before 6:00 PM deadline with no penalty. What is the probability that at least 280 rooms will be occupied? Use binomial distribution to find the exact value and ...
*Sunday, November 30, 2014 by Richa*

** Statistics**

A recent study of US children under 11 years old found that they spend on average 142 minutes a day watching tv. Assuming normal distribution with the standard deviation of 44 minutes, answer the following. A) what percent of children of this age spends over 90 minutes per day...
*Sunday, November 30, 2014 by Junior*

**statistics**

A simple random sample of students is selected, and the students are asked how much time they spent preparing for a test. The times (in hours) are as follows: 1.3 7.2 4.2 12.5 6.6 2.5 5.5 Based on these results, a confidence interval for the population mean is found to be &...
*Sunday, November 30, 2014 by Brian*

**statistics**

A 4 to 7 month old baby sleeps an average of 14 hours per day. At this age, babies sleep patterns follow normal distribution with the standard deviation of 1.6 a) is it unusual for a baby to sleep under 12 hours a day? b) In a random sample of 10 babies of this age,find the ...
*Sunday, November 30, 2014 by adriana*

**statistics**

A 4 to 7 month old baby sleeps an average of 14 hours per day. At this age, babies sleep patterns follow normal distribution with the standard deviation of 1.6 a) is it unusual for a baby to sleep under 12 hours aday? b) In a random sample of 10 babies of this age,find the ...
*Sunday, November 30, 2014 by adriana*

**statistics**

An air gap exists between fluids in a bottle and the cap of the bottle. At a firm producing olive oil, the gap is critical to the shelf life of their product. If the recent information reveals that the average gap is 9.46 mm with a standard deviation of 0.233, calculate the ...
*Sunday, November 30, 2014 by Deeptimaan*

**statistics**

A company has been studying the performance of their sales department. The measure of performance used is: average monthly sales amount in dollars. For the past 12 months, the average monthly sales amount has been $4,532 with a standard deviation of $386. Calculate the ...
*Sunday, November 30, 2014 by Deeptimaan*

**Statistics**

10 A color candy was chosen randomly out of a bag. Below are the results: Color Probability Blue 0.30 Red 0.10 Green 0.15 Yellow 0.20 Orange ??? a. What is the probability of choosing a yellow candy? b. What is the probability that the candy is blue, red, or green? c. What is ...
*Saturday, November 29, 2014 by Den*

**statistics**

What decision is reached when 'a' is greater than the p-value? When 'a' is greater than the p-value, the null hypothesis is rejected. Why is this decision reached?
*Friday, November 28, 2014 by MissPatte*

**business statistics**

10.55 Consider an experiment with four groups, with eight values in each. For the ANOVA summary table below, fill in all the missing results: Source Degrees of Freedom Sum of Squares Mean Square (Variance) F Among groups c - 1 = ? SSA = ? MSA = 80 FSTAT = ? Within groups n - c...
*Thursday, November 27, 2014 by bill*

**Statistics**

Suppose that hours of sleep per night for single adults between 30 and 40 years of age are normally distributed with a mean of 6.7 hours and a standard deviation of 1.1 hours. What proportion of adults sleep longer than 4.5 hours per night? (Report to 3 decimal places.)
*Wednesday, November 26, 2014 by Beth*

**Statistics 2 please give answers to the below ques**

According to a study conducted by a statistical organization, the proportion of americans who are satisfied with the way things are going in their lives is 0.82. Suppose that a random sample of 105 Americans is obtained. (Please answer the below and round to four decimals ...
*Wednesday, November 26, 2014 by LADO*

**Statistics 1 plaese give answers to below question**

Suppose a simple random sample of size n=150 is obtained from a population whose size is N=20,000 and whose population proportion with a specified characteristic is p=0.8. Please answer questions (1) through (5) below. (1) Describe the sampling distribution of p^ (choose the ...
*Wednesday, November 26, 2014 by LADO*

**Statistics**

For the following set of scores, fill in the cells. The mean is 70 and the standard deviation is 8. Raw score Z score 68.0 ? ? –1.6 82.0 ? ? 1.8 69.0 ? ? –0.5 85.0 ? ? 1.7 72.0 ?
*Wednesday, November 26, 2014 by KIM*

**statistics**

express the CI (0.045, 0.133) in the form of p ̂-E<p<p ̂+E
*Tuesday, November 25, 2014 by MissPatte*

**Statistics**

The grades in the final exam of a random sample of 25 students produce a standard deviation, s = 9.5. a) Construct a 90% confidence interval estimate for the population variance, . b) Can we infer at 10% level of significance that the population variance is significantly ...
*Tuesday, November 25, 2014 by Kendra*

**statistics**

Test whether women have, on average, more pairs of shoes than men. Include all forms of sneakers, shoes, sandals, and boots. Use staffs at UTeM as the sample.
*Tuesday, November 25, 2014 by help me*

**statistics**

Buy three small packages of M&Ms and 5 small packages of another brand of candy (same net weight as the M&Ms). Test whether or not the mean number of candy pieces per package is the same for the two brands.
*Tuesday, November 25, 2014 by help me*

**statistics**

Suppose that young adults own an average of 3 pairs of jeans. Survey 8 people from your class to determine if the average is higher than 3.
*Tuesday, November 25, 2014 by help me*

**statistics**

In a recent survey, it was stated that Malaysians watch videos on YouTube on average two hours per day. Assume that σ = 2. Using students in UTeM as the sample, conduct a hypothesis test to determine if the average for students at UTeM is lower
*Tuesday, November 25, 2014 by help me*

**MAT201-Basic Statistics**

A dealership sold 15 cars last month. The purchase price of the cars, rounded to the nearest thousand, is represented in the table Purchase Price/# of cars sold $15,000 3 $20,000 4 $23,000 5 $25,000 2 $45,000 1 A.Find the mean and median B. Which measures best represents the ...
*Monday, November 24, 2014 by Pat*

**MAT201 Basic Statistics**

A dealership sold 15 cars last month. The purchase price of the cars, rounded to the nearest thousand, is represented in the table Purchase Price/# of cars sold $15,000
*Monday, November 24, 2014 by Pat*

**statistics**

In a correlation study, we seek to determine; *if the IV cause an outcome in the DV. *Which variable is the cause and which variable is the effect. *The direction of causation. *How well one variable predicts another variable.
*Monday, November 24, 2014 by erica*

**statistics**

from the following list of numbers of discharges each day in september, compute the mean, mode, and range.
*Monday, November 24, 2014 by Anonymous*

**statistics**

your medical terminology instructor listed the following grades for the class out of a 75-point: 33,34,43,45,45,54,59,60,62,64,66,67,68, 67,68,68,69,70,70
*Monday, November 24, 2014 by Anonymous*

**Statistics**

A sample of 148 values is randomly selected from a population with mean, μ, equal to 46 and standard deviation, σ, equal to 17. (Give your answers correct to one decimal place.) (a) Determine the interval (smallest value to largest value) within which you would ...
*Sunday, November 23, 2014 by Dakota*

**statistics**

You have a face-to-face statistics class in the traditional classroom setting. There are 25 males and 45 females enrolled. You’re the instructor so you like to arrive in the classroom before the first students arrive. What is the probability that the first student who ...
*Sunday, November 23, 2014 by Anonymous*

**statistics**

An introductory psychology class has 9 freshman males, 15 freshman females, 8 sophomore males, and 12 sophomore females. If one student is randomly selected from this class, what is the probability of selecting a female? Round to the nearest hundredths place if a fraction
*Sunday, November 23, 2014 by Anonymous*

**Statistics**

If a committee of 4 students is selected from a class of 16 students, how many ways can this be done?
*Sunday, November 23, 2014 by Judy*

**statistics**

In a study for a local clinic, you have found that the average number of patients between 9am and 12noon on Friday is five patients. Using a Poisson distribution and the probability more than eight patients will arrive?
*Sunday, November 23, 2014 by loh*

**statistics**

Farmer Max, sells grain to Germany, owns 60 acres of wheat fields. Based on the past experience, he knows that the yield from each individual acre is normally distributed with mean 120 bushels and standard deviation 12 bushels. Help Farmer Max plan for his next year crop by ...
*Sunday, November 23, 2014 by loh*

**Statistics**

The Graduate Record Exam has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. A. What percentage of the persons who take the test score above 1300? b. What percentage ...
*Sunday, November 23, 2014 by Charlene*

**statistics**

Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. A survey examines the preferences for laundry detergent. ***The admissions office wants to estimate the cost of textbooks for students at ...
*Saturday, November 22, 2014 by Jenn*