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September 20, 2014

September 20, 2014

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
*Thursday, June 27, 2013 at 5:55pm*

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*Thursday, June 27, 2013 at 5:52pm*

**statistics & probability**

according to a survey, 30% of 18-25 year olds have blue eyes. In a random sample of 8 people in this age group what is the probability that exactly 0 have blue eyes?
*Thursday, June 27, 2013 at 2:03am*

**Statistics**

If 1000 raffle tickets were sold for a TV prize that is worth $275 and a ticket number is drawn to determine the winner, what is the expected value of the raffle?
*Thursday, June 27, 2013 at 12:09am*

**Statistics Help**

Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (b) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
*Wednesday, June 26, 2013 at 8:49pm*

**Statistics**

A simple random sample of 10 households, the number of TV's that each household had is as follows: 1, 3, 1, 2, 0, 2, 1, 1, 1, 5 Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 0.56. What is the ...
*Wednesday, June 26, 2013 at 2:25pm*

**statistics**

2. The manager of a sandwich shop gathers data on what people spend on lunch on a particular day of the week. The results are $4.20, $4.22, $2.35, $4.32, $5.25, $6.48, $6.78, $8.59, $6.95, $5.52, $6.83, $7.35, $4.36, $9.39, $6.42. To the degree that this represents the ...
*Wednesday, June 26, 2013 at 1:52pm*

**Statistics**

A college admissions officer takes a simple random sample of 103 entering freshmen and computes their mean mathematics SAT score to be 493. Assume the population standard deviation is 112. What is the lower bound of the 99% confidence interval? Round your answer to the nearest...
*Wednesday, June 26, 2013 at 9:30am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 5:10am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 4:16am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 4:15am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 4:09am*

**Statistics check**

Complete the hypothesis test with alternative hypothesis ƒÊd ‚ 0 based on the paired data that follows and d = O - Y. Use ƒ¿ = 0.01. Assume normality. Oldest 188 174 192 196 65 Youngest 186 168 199 199 69 (a) Find t. (Give your answer correct ...
*Tuesday, June 25, 2013 at 8:00pm*

**statistics**

Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
*Tuesday, June 25, 2013 at 7:54pm*

**Statistics**

Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 386 327 H 414 321
*Tuesday, June 25, 2013 at 7:52pm*

**statistics**

The mean loss for customers at the first State bank (which is not insured) was $150.00 the standard deviation of the losses was -$125.00
*Tuesday, June 25, 2013 at 5:08pm*

**statistics**

the mean loss for customers at first state bank (which was not insured) was $150. The standard deviation of the losses was -$125
*Tuesday, June 25, 2013 at 3:21pm*

**statistics**

According to Advertising Age, the average base salary for women working as copywriters is $66,000. Assume that the salaries are normally distributed and that the standard deviation is $7,500. a. What is the probability of a woman receiving a salary between $60,000 and $75,000...
*Tuesday, June 25, 2013 at 12:31pm*

**statistics**

The Stop N’ Go convenience chain recently selected a random sample of 10 customers. The store monitored the number of times each customer made a purchase at the store over a two-month period. The following data were collected:
*Tuesday, June 25, 2013 at 12:21pm*

**statistics help**

Complete the hypothesis test with alternative hypothesis ƒÊd ‚ 0 based on the paired data that follows and d = O - Y. Use ƒ¿ = 0.01. Assume normality. Oldest 188 174 192 196 65 Youngest 186 168 199 199 69 (a) Find t. (Give your answer correct ...
*Monday, June 24, 2013 at 10:28pm*

**statistics**

Could someone work a problem like this one, for an example. Complete the hypothesis test with alternative hypothesis ìd < 0 based on the paired data that follow and d = M - N. Use á = 0.02. Assume normality. M 49 67 45 57 57 48 N 57 68 47 60 64 55 (a) Find t...
*Monday, June 24, 2013 at 5:39pm*

**statistics**

6. According to the records of Enersource, an electric company serving the Mississauga area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumption during winter by all households in ...
*Sunday, June 23, 2013 at 9:51pm*

**statistics**

The pucks used by the National Hockey League for ice hockey must weigh between 5.5 and 6.0 ounces. Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.75 ounces and a standard deviation of 0.11 ounce. What percentage of the pucks ...
*Sunday, June 23, 2013 at 9:51pm*

**statistics**

Page 1 of 2 4. Despite all efforts by the quality control department, the fabric made at Benton Corporation always contains a few defects. A certain type of fabric made at this corporation contains an average of .5 defects per 500 yards. Using the Poisson formula, find the ...
*Sunday, June 23, 2013 at 9:51pm*

**statistics**

3. Magnetic resonance imaging (MRI) is a process that produces internal body images using a strong magnetic field. Some patients become claustrophobic and require sedation because they are required to lie within a small, enclosed space during the MRI test. Suppose 29% of all ...
*Sunday, June 23, 2013 at 9:50pm*

**statistics**

2. Bender electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 100 boxes, each box containing 20 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...
*Sunday, June 23, 2013 at 9:50pm*

**Statistics**

1. Let x be the number of heads obtained in two tosses of a coin. The following table lists the probability distribution of x. x 0 1 2 P(x) .25 .50 .25 Calculate the mean and standard deviation of x. Give a brief interpretation of the value of the mean.
*Sunday, June 23, 2013 at 9:49pm*

**statistics check**

The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.) x 7 10 19 9 20 22 6 ...
*Sunday, June 23, 2013 at 8:41pm*

**statistics check**

Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (b) Calculate the covariance. (Give your answer correct to two decimal places.) 5.35 was my answer . (c) Calculate sx and sy. (Give your answers correct to three ...
*Sunday, June 23, 2013 at 7:45pm*

**statistics**

According to the Journal of the American Medical Association, the doctors found that in the week before and the week after Thanksgiving, there were 12,000 total deaths and 6062 of them occurred in the week before Thanksgiving. Construct a 95% confidence interval of the ...
*Sunday, June 23, 2013 at 5:01pm*

**statistics**

The National Highway Traffic Safety Administration analyzes the crash test data for new cars. One variable measured is the severity of the injury due to a collision. The higher the severity, the higher the points assigned. Assume that the injury rating is normally distributed ...
*Sunday, June 23, 2013 at 5:00pm*

**Statistics**

According to the American Automobile Association (AAA), the mean cost of a gallon of regular unleaded fuel in 2007 was $2.835. AAA noted that the standard deviation of the fuel price was $0.15. A random sample of n=100 gas stations is selected and the mean gas price is ...
*Sunday, June 23, 2013 at 5:00pm*

**statistics **

Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4, with n...
*Sunday, June 23, 2013 at 2:08pm*

**statistics**

the probability that a football game will go into overtime is 17%. In 240 randomly selected football games, what is the mean and the standard deviation of the number that went into overtime
*Sunday, June 23, 2013 at 9:00am*

**statistics**

Consider the following table and use the formulas that are given for computing the correlation coefficient. (Give your answer correct to two decimal places.) x 1 1 0 0 0 y 7 3 5 6 6 r = n xy − x y n x2 − x 2 n y2 − y 2 (1) r = SS(xy) SS(x) · SS(y) (2) ...
*Sunday, June 23, 2013 at 12:06am*

**statistics**

Consider the following set of data. (18, 12), (29, 48), (65, 29), (82, 24), (115, 56), (124, 13) (a) Calculate the covariance of the set of data. (Give your answer correct to two decimal places.) . (b) Calculate the standard deviation of the six x-values and the standard ...
*Sunday, June 23, 2013 at 12:04am*

**statistics**

Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (b) Calculate the covariance. (Give your answer correct to two decimal places.) (c) Calculate sx and sy. (Give your answers correct to three decimal places.) sx = sy...
*Sunday, June 23, 2013 at 12:03am*

**statistics**

The customer bills in a family restaurant are normally distributed. The bills mean is $28 and has a standard deviation of $6. a. Identify what the random variable you are measuring is in this problem. b. What is the probability that a randomly selected bill will be at least $...
*Saturday, June 22, 2013 at 2:15pm*

**statistics**

What is your conclusion based on the following data? A survey was conducted to study the effects of weight loss from a low fat diet. Two random samples of 100 people each were selected. One group was put on the low fat diet and the other group on the regular diet. The weight ...
*Saturday, June 22, 2013 at 1:21pm*

**statistics**

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...
*Saturday, June 22, 2013 at 1:19pm*

**statistics**

Calculate p ̅. x1 20 n1 50 x2 55 n2 100
*Saturday, June 22, 2013 at 1:18pm*

**statistics**

A store manager claims that the average age of his customers is less than 40 years old, while the industry average is 40 years old. He asks you to test his thinking. You collect a sample of 50 customers and found that the average age is 38.7. Assuming that the population ...
*Saturday, June 22, 2013 at 1:17pm*

**statistics**

How is the P-value used to determine whether or not to reject the null hypothesis?
*Saturday, June 22, 2013 at 1:17pm*

**Statistics**

There were two independent groups who took a school course by different modes. The first sample of students took the course in the online and the second sample took the course in the conventional face to face mode. Using the sample data determine if there is significant ...
*Saturday, June 22, 2013 at 4:41am*

**statistics**

If a teacher wants to test her belief that more than 5 students in college classes typically receive A as a grade, she'll perform? a. two tailed testing of a mean b. two tail testing of a proportion c. one tail testing of a proportion d. one tail testing of a mean I choose...
*Friday, June 21, 2013 at 6:03pm*

**statistics**

A normal distribution has a standard deviation equal to 23. What is the mean of this normal distribution if the probability of scoring above x = 181? record to 1 decimal place
*Friday, June 21, 2013 at 1:14am*

**Statistics**

A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that the average time ...
*Thursday, June 20, 2013 at 5:36pm*

**Statistics**

The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $2,636. Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $2,680?
*Thursday, June 20, 2013 at 5:36pm*

**Statistics**

Suppose that a sample of size 58 is drawn from a population with mean 23 and standard deviation 80. Find the value of , the mean of the distribution of sample means. Wrtie only a number as your answer.
*Thursday, June 20, 2013 at 2:19pm*

**statistics**

A human resources manager wants to determine a confidence interval estimate for the mean test score for the next office-skills test to be given to a group of job applicants. In the past, the test scores have been normally distributed with a mean of 74.2 and a standard ...
*Wednesday, June 19, 2013 at 5:12pm*

**statistics**

mortgage broker is offering home mortgages at a rate of 9.5%, but the broker is fearful that this value is higher than many others are charging. A sample of 40 mortgages filed in the county courthouse shows an average of 9.25% with a standard deviation of 8.61%. Does this ...
*Wednesday, June 19, 2013 at 5:09pm*

**statistics**

A woman and her son are debating about the average length of a preacher's sermons on Sunday morning. Despite the mother's arguments, the son thinks that the sermons are more than twenty minutes. For one year, he has randomly selected 12 Sundays and found an average ...
*Wednesday, June 19, 2013 at 5:06pm*

**statistics**

What sample size is required from a very large population to estimate a population proportion within 0.05 with 95% confidence? Don't assume any particular value for p. A. 271 B. 38 C. 385 D. 767
*Wednesday, June 19, 2013 at 5:05pm*

**Math**

Weights of the vegetables in a field are normally distributed. From a sample Carl Cornfield determines the mean weight of a box of vegetables to be 180 oz. with a standard deviation of 8 oz. He wonders what percent of the vegetable boxes he has grouped for sale will have a ...
*Wednesday, June 19, 2013 at 12:01pm*

**statistics**

In 1980 (before the era of in-vitro fertilization), there were 3,612,258 births in the United States (according to the U.S. Census Bureau), of which 68,339 births were to twins and 1,337 births were to triplets or more. What was the probability of having multiples (twins or ...
*Wednesday, June 19, 2013 at 9:18am*

**Statistics**

There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
*Tuesday, June 18, 2013 at 11:38pm*

**Math**

Weights of the vegetables in a field are normally distributed. From a sample Carl Cornfield determines the mean weight of a box of vegetables to be 180 oz. with a standard deviation of 8 oz. He wonders what percent of the vegetable boxes he has grouped for sale will have a ...
*Tuesday, June 18, 2013 at 11:15pm*

**statistics**

the mean of sat scores of a specific month is1000 with a standard deviation of 100. find the 90 percentiles . assume that the sat score is normal distributed
*Tuesday, June 18, 2013 at 8:34pm*

**statistics**

A study of peach trees found that the average number of peaches per tree was 625. The standard deviation of the population is 140 peaches per tree. Ascientist wishes to find 80% confidence interval for the mean number of peaches per tree. How many trees does she need to sample...
*Tuesday, June 18, 2013 at 8:04pm*

**statistics**

What is the rejection region for a two tailed test when a=0.05? a. [z] > 2.575 b. z>2.575 c. [z] > 1.96 d. [z]>1.645
*Tuesday, June 18, 2013 at 5:17pm*

**statistics**

Determine which of the following four population size and sample size combinations would not require the use of the the finite population correction factor in calculating the standard error. a. N = 2500; n = 75 b. N = 150; n = 25 c. N = 15,000; n = 1,000 d. N = 1500; n = 300
*Tuesday, June 18, 2013 at 5:12pm*

**Statistics**

Suppose that the weight of male babies less than 2 months old is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. A sample of 36 babies is selected. What is the probability that the average weight of the samlpe is less than 11.29 pounds?
*Tuesday, June 18, 2013 at 1:28pm*

**Statistics**

Suppose that a sample of size 60 is drawn from a population with mean 73 and standard deviation 79. Find the value of , the standard deviation of the distribution of sample means. How do I work this on my calculator?
*Tuesday, June 18, 2013 at 12:09pm*

**statistics**

The distribution of weekly salaries at a large company is right skewed with a mean of $1000 and a standard deviation of $350. What is the probability that the sampling error made in estimating the mean weekly salary for all employees of the company by the mean of a random ...
*Tuesday, June 18, 2013 at 11:17am*

**statistics check**

Consider the following. (Give your answers correct to two decimal places.) (a) Determine the value of the confidence coefficient z(á/2) for 1 - á = 0.87. my answer .44 . (b) Determine the value of the confidence coefficient z(á/2) for 1 - á = 0.91. ...
*Monday, June 17, 2013 at 8:44pm*

**Statistics**

3. A telephone company wants to estimate the porportion of households that would purchase an additional service line if it were made available at a substantially reduced cost. A random sample of 500 households is selected and the results indicate that 135 of the households ...
*Monday, June 17, 2013 at 2:46pm*

**Statistics**

A survey of 90 families showed that 40 owned at least one gun. Find the 95% confidence interval of the true proportion of families who own at least one gun. Example
*Monday, June 17, 2013 at 2:01pm*

**Statistics**

2. For a distribution of scores, which of the following Z score values represents the location closest to the mean?
*Monday, June 17, 2013 at 6:09am*

**Statistics**

1. If the mean is 40 in a normal distribution, what is the median?
*Monday, June 17, 2013 at 6:07am*

**Statistics**

The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean 43 and standard deviation 7. Find the percentile corresponding to p = 29% of the tire lifetimes.
*Sunday, June 16, 2013 at 9:15pm*

**Statistics**

Electricity bills in a certain city have mean $120.08. Assume the bills are normally distributed with standard deviation $14.40. Find the value that separates the lower 52% of the bills from the rest.
*Sunday, June 16, 2013 at 9:15pm*

**Statistics**

Suppose that the weight of male babies less than 2 months old is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. What proportion of babies weigh less than 11.00 pounds?
*Sunday, June 16, 2013 at 1:20pm*

**statistics help**

The number of ships to arrive at a harbor on any given day is a random variable represented by x. The probability distribution of x is as follows. (Give your answers correct to two decimal places.) x 10 11 12 13 14 P(x) 0.38 0.1 0.07 0.12 0.33 (a) Find the mean of the number ...
*Saturday, June 15, 2013 at 9:28pm*

**Statistics help**

Suppose that you are in a class of 32 students and it is assumed that approximately 9% 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. Incorrect: Your answer is ...
*Saturday, June 15, 2013 at 8:55pm*

**statistics**

It is known that for a certain firm specializing in manufacturing female T-shirts, the ‘Small’ sizes have a shoulder size of 14 inches or less. If these T-shirt shoulder sizes are normally distributed with a mean of 16 inches and a standard deviation of 2 inches (i)...
*Saturday, June 15, 2013 at 5:55pm*

**Statistics**

A Youth Correction Center completed a study to explore the proportion of delinquent behaviour, according to birth order, among two groups of teenagers (males and females, age 12-17). The data are given in the table below. Determine whether there is a difference between male ...
*Saturday, June 15, 2013 at 2:56pm*

**Statistics**

In a survey of 1233 people, 917 people said they voted in a recent presidential election. Voting records showed that 72% of eligible voters actually did vote. Given that 72% of eligible voters actually did vote, find the probability that among 1233 randomly selected voters, at...
*Saturday, June 15, 2013 at 1:06am*

**Statistics**

An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 140 lb and 181 lb. The new population of pilots has normally distributed weights with a mean of 146 lb and a standard deviation of 28.9 lb. A) If a pilot is ...
*Saturday, June 15, 2013 at 1:03am*

**Statistics help**

A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 306 lb. and a variance of 2209. (Give your answers correct to four decimal places.) (a) If a truck can carry 3940 lb. and 25 appliances need to be picked up, what ...
*Friday, June 14, 2013 at 7:01pm*

**Statistics help**

Consider the following. (Give your answers correct to two decimal places.) (a) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3989. (b) Find the standard score (z) such that the area above the mean and below z under the ...
*Friday, June 14, 2013 at 6:53pm*

**Business Statistics **

A random sample of six CEOs reported how many times per year they play tennis. The data follows. 3 41 96 32 52 19 Assuming the number of games played is normally distributed and the population standard deviation σ = 10, a 95% confidence interval for μ is:
*Friday, June 14, 2013 at 6:23pm*

**statistics**

How do you calculate the z-score for a package weighing 29.6 pounds ( round to 2 decimals)?
*Friday, June 14, 2013 at 8:24am*

**Statistics**

In a genetics experiment on peas, one sample of offspring contained 421 green peas and 166 yellow peas. Based on these results, estimate the probability of getting an offspring pea that is green. Is the result reasonably close to the value of 3/4 that was expected ?
*Thursday, June 13, 2013 at 9:01pm*

**Statistics**

The probability of a randomly selected car crashing during a year in a certain country is .0479. If a family has three cars, find the probability that at least one of them has a car crash during a year.
*Thursday, June 13, 2013 at 8:46pm*

**statistics**

An airline has a policy of booking as many as 17 persons on an airplane that can seat only 16. (Past studies have shown that only 89% of the booked passengers actually arrive for a flight.) Find the probability that if an airline books 17 persons, not enough seats will be ...
*Wednesday, June 12, 2013 at 3:27pm*

**statistics**

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 answered...
*Wednesday, June 12, 2013 at 10:52am*

**Statistics**

Find the area of the shaded region where a = -2.15 and b = 2.12. Note: the graph may not be drawn to scale.
*Wednesday, June 12, 2013 at 9:44am*

**Statistics**

4. An environmental agency will randomly select 4 houses from a block containing 25 houses for a radon check. a) How many total selections are possible? b) How many permutations are possible?
*Tuesday, June 11, 2013 at 1:45pm*

**Statistics**

3. The following table gives a two-way classification of all basketball players at a university who began their college careers between 2004 and 2008, based on gender and whether or nor they graduated. Graduated Did Not Graduate Male 126 55 Female 133 32 a) P(female or did not...
*Tuesday, June 11, 2013 at 1:45pm*

**Statistics**

. Two thousand randomly selected adults were asked whether or not they have ever shopped on the internet. The following table gives a two-way classification of the responses obtained. Have shopped Have never shopped Male 500 700 Female 300 500 Suppose one adult is selected at ...
*Tuesday, June 11, 2013 at 1:44pm*

**Statistics**

1. The mean monthly mortgage paid by all home owners in a town is $2365 with a standard deviation of $340. a) Using Chebyshev’s theorem, find at least what percentage of all home owners in this town pay a monthly mortgage of (i) $1685 to $3045 & (ii) $1345 to $3385 b) ...
*Tuesday, June 11, 2013 at 1:44pm*

**statistics**

Let x and y be the amounts of time (in minutes) that a particular commuter must wait for a train on two independently selected days. Define a new random variable w by w = x + y, the sum of the two waiting times. The set of possible values for w is the interval from 0 to 2a (...
*Monday, June 10, 2013 at 6:58pm*

**Statistics**

the 1st class in a relative frequency table of 50-59 an the corresponding relative frequency is 0.2. What does the 0.2 value indicate
*Monday, June 10, 2013 at 5:43pm*

**statistics**

A nutritionist studying weight gain for college freshmen obtains a sample of n = 20 first year student at the state college. Each student is weighed on the first day of school an again on the last day of the semester. The following scores measure the change in weight, in ...
*Sunday, June 9, 2013 at 6:09pm*

**statistics**

Suppose that a marketing firm sends questionnaires to two different companies. Based on historical evidence, the marketing research firm believes that each company, independently of the other, will return the questionnaire with a probability of 0.30. What is the probability ...
*Sunday, June 9, 2013 at 6:04pm*

**statistics**

Suppose that a marketing firm sends questionnaires to two different companies. Based on historical evidence, the marketing research firm believes that each company, independently of the other, will return the questionnaire with a probability of 0.30. What is the probability ...
*Sunday, June 9, 2013 at 5:41pm*

**statistics**

A sample of n = 7 scores has a mean of M = 5. After one new score is added to the sample, the new mean is found to be M = 6. What is the value of the new score? (Hint: Compare the values for ƩX before and after the score was added.
*Sunday, June 9, 2013 at 5:35pm*

**statistics**

14) A population of N = 20 scores has a mean of µ = 15. One score in the population is changed from X = 8 to X =28. What is the value for the new population mean?
*Saturday, June 8, 2013 at 11:37pm*

**Statistics**

height shoe size (if you wear men's shoes, add 2) 61 6.5 67 9 63 7 66 8 60 6 71 10 71 11 63 8 63 7 66 62 7 64 6.5 61 7 64 7.5 63 8 58 6.5 63 9 62 6 61 7 74 60 6.5 60 7.5 63 8 Mean 63.73913043 7.571428571 Standard Deviation 3.922167667 1.296974501 H sub 0: x̄ = 8 H ...
*Saturday, June 8, 2013 at 6:20pm*

**Statistics**

Suppose that A and B are events defined on a common sample space and that the following probabilities are known. Find P(A or B). (Give your answer correct to two decimal places.) P(A) = 0.34, P(B) = 0.41, P(A | B) = 0.2
*Saturday, June 8, 2013 at 3:27pm*

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