Friday

May 22, 2015

May 22, 2015

**statistics**

Suppose a Stat 1450 web class has 15 males (8 are also students at OSU) and 12 females (7 are also students at OSU). What is the probability that a randomly selected student is either female, or also a student at OSU? Submit answer in decimal form and round to the nearest ...
*Saturday, February 8, 2014 at 5:10pm*

**statistics**

A multiple choice test has 3 questions and each question has 3 choices. If Nacho takes this test, what is the probability that he will: (a)answer all questions correctly? (b)answer all questions wrong? (c)answer two questions correctly?
*Friday, February 7, 2014 at 11:05pm*

**statistics**

a sample of men's heights was taken. The average height was 68.5 inches, the SD was 1.95 inches. Use the normal curve to estimate the percentage of men with heights between 69 inches and 70 inches.
*Friday, February 7, 2014 at 10:11pm*

**Statistics**

Determine if the following are probability distributions (if no, state why). a. X 3 6 9 12 15 P(X) 4/9 2/9 1/9 1/9 1/9
*Friday, February 7, 2014 at 7:06pm*

**Statistics**

If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous random variable may not be normally ...
*Friday, February 7, 2014 at 4:25pm*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*Friday, February 7, 2014 at 4:23pm*

**Statistics**

A salesperson goes door-to-door in a residential area to demonstrate the use of a new Household appliance to potential customers. She has found from her years of experience that after demonstration, the probability of purchase (long run average) is 0.30. To perform ...
*Friday, February 7, 2014 at 4:15pm*

**statistics**

how do the 4th grade girls weight in principal ben's school compare to the national mean weigh = 90 sd=15
*Thursday, February 6, 2014 at 9:58pm*

**statistics**

howdo i find the square root of -2
*Thursday, February 6, 2014 at 12:27am*

**statistics**

A neuropsychologist is interested only in studying the most deviant portion of this population, that is, those individuals who fall within the top 10% and the bottom 10% of the distribution. She must determine the ages that mark these boundaries. What are these ages?
*Wednesday, February 5, 2014 at 11:29am*

**statistics**

A study was conducted to count the different age groups of kids that usually play in a park on a Sunday morning. The following data was collected Years Old Number of Kids 1 3 2 22 3 8 4 16 5 9 a) List the simple events of the experiment. b) What is the probability of each ...
*Tuesday, February 4, 2014 at 6:00pm*

**statistics**

A study was conducted to count the different age groups of kids that usually play in a park on a Sunday morning. The following data was collected Years Old Number of Kids 1 3 2 22 3 8 4 16 5 9 a) List the simple events of the experiment. b) What is the probability of each ...
*Tuesday, February 4, 2014 at 5:59pm*

**STATISTICS**

1. 28 young adults are asked how much time they spend, in minutes, per week on Pokémon. Their responses are shown below. 96 17 97 35 24 57 27 34 87 5 21 87 6 52 2 66 18 29 84 39 19 37 63 58 39 10 51 75 QUESTION IS THIS SAMPLE OR POPULATION?
*Tuesday, February 4, 2014 at 11:04am*

**Statistics in Psychology**

Please help. Thank you in advance for your time. In an English class last semester, Foofy earned a 76 (x¯= 85, Sx= 10). Her friend, Bubbles, in a different class, earned a 60 (x¯= 50, Sx = 4). Should Foofy be bragging about how much better she did? Why?
*Monday, February 3, 2014 at 12:20pm*

**Statistics in Psychology**

Please help with this question, THANK YOU in advance. A line should be over the top of both X’s. In an English class last semester, Foofy earned a 76 (X = 85, Sx = 10). Her friend, Bubbles, in a different class, earned a 60 (X=50, Sx = 4). Should Foofy be bragging about ...
*Monday, February 3, 2014 at 11:48am*

**Statistics in Psychology**

Please help me with both of these questions. THANK YOU in advance for your for you help. 13. For the data, 9 5 10 7 9 10 11 8 12 7 6 9 (a) Compute the z-score for the raw score of 10. (b) Compute the z-score for the raw score of 6. 14. For the data in question 13, find find ...
*Monday, February 3, 2014 at 11:25am*

**Statistics**

For an IQ test, we know the population n=100 and the ox = 16. We are interested in creating the sampling distribution when N = 64. (a) What does that sampling distribution of means show? (b) What is the shape of the distribution of IQ means and the mean of the distribution? (c...
*Monday, February 3, 2014 at 11:21am*

**Statistics**

As part of studying the relationship between mental and physical health, you obtain the following heart rates: 73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78 In terms of differences in heart rates, interpret these data using the following: (a) the range, (b) the variance, ...
*Sunday, February 2, 2014 at 10:31pm*

**Statistics**

Please help me with this question: For an IQ test, we know the population 5 100 and the X 5 16. We are interested in creating the sampling distribution when N 5 64. (a) What does that sampling distribution of means show? (b) What is the shape of the distribution of IQ...
*Sunday, February 2, 2014 at 7:27pm*

**Statistics in Psychology **

QUESTION 25: In a study you obtain the following data representing the aggressive tendencies of some football players:40 30 39 40 41 39 31 28 33(a) Researchers have found that is 30 in the population of nonfootball players, 1X 5 5. 2 Using both tails of the sampling ...
*Sunday, February 2, 2014 at 4:43pm*

**Statistics**

Foofy says a deviation of +5 is always better than a deviation of -5. Why is she correct or incorrect?
*Sunday, February 2, 2014 at 3:31pm*

**Statistics**

As part of studying the relationship between mental and physical health, you obtain the following heart rates: 73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78
*Sunday, February 2, 2014 at 3:02pm*

**Statistics**

Assume that the data in question 25 reflect a highly skewed interval variable. (a) What statistics would you compute to summarize these conditions? (b) We compute them to be 14, 12, and 8.5, respectively. What conclusion about the study should you draw?(c) What conclusion ...
*Sunday, February 2, 2014 at 3:00pm*

**Statistics**

What does the empirical rule say about the proportion of players who are between 62.7 inches and 75.3 inches? c.
*Sunday, February 2, 2014 at 2:58pm*

**Statistics**

In a normal distribution of scores, four participants obtained the following deviation scores: +1, -2, +5, and -10. (a) Which score reflects the highest raw score? (b) Which score reflects the lowest raw score? (c) Rank-order the deviation scores in terms of their frequency, ...
*Sunday, February 2, 2014 at 2:58pm*

**Psychology (statistics)**

Assume that the data in question 25 reflect a highly skewed interval variable. (a) What statistics would you compute to summarize these conditions? (b) We compute them to be 14, 12, and 8.5, respectively. What conclusion about the study should you draw? (c) What conclusion ...
*Sunday, February 2, 2014 at 11:41am*

**Psychology (statistics)**

In an English class last semester, Foofy earned a 76 1X 5 85, SX 5 10). Her friend, Bubbles, in a different class, earned a 60 1X 5 50, SX 5 4). Should Foofy be bragging about how much better she did? Why?
*Sunday, February 2, 2014 at 11:40am*

**Statistics**

A study was conducted to investigate the effect of management training on the decisionmaking abilities of supervisors in a large corporation. Sixteen supervisors were selected and eight were randomly chosen to receive managerial training. Four trained and four untrained ...
*Sunday, February 2, 2014 at 11:23am*

**Statistics**

Data below corresponds to sample weights of two different types (A and B) of Tuna. We want to test at significance level = .05 if the two tuna populations from which the samples come have the same variance. A .99 1.92 1.23 .85 .65 .69 .6 .53 1.41 1.12 .63 .67 .6 .66 1.9 ...
*Sunday, February 2, 2014 at 11:21am*

**Statistics **

In a normal distribution of scores, four participants obtained the following deviation scores: 11, 22, 15, and 210. (a) Which score reflects the highest raw score? (b) Which score reflects the lowest raw score? (c) Rank-order the deviation scores in terms of their frequency, ...
*Sunday, February 2, 2014 at 1:44am*

**Statistics**

If I choose 5 cards at random, how many ways are there to get a full house?
*Sunday, February 2, 2014 at 1:02am*

**statistics**

Height of children in kindergarten described by normal mode with mean 39.2 inches and standard deviation of 1.9 inches. What percent of children can expect to be less than 38 inches tall?
*Saturday, February 1, 2014 at 9:36pm*

**Statistics**

Pine Pizza Palace sells pizza plain or with one or more of the following toppings: pepperoni, sausage, mushrooms, olives,onions, or anchovies. (six toppings or plain) How many different pizzas can be made? (Hint: A person can select or not select each item.)
*Saturday, February 1, 2014 at 9:34pm*

**statistics for managers**

Several statistical tests have a way to measure effect size. What is this, and when might you want to use it in looking at results from these tests on job related data?
*Thursday, January 30, 2014 at 10:14pm*

**Statistics**

The per-store daily customer count (i.e., the mean number of customers in a store in one day) for a nationwide convenience store chain that operates nearly 10,000 stores has been steady, at 900, for some time. To increase the customer count, the chain is considering cutting ...
*Thursday, January 30, 2014 at 9:34pm*

**Statistics**

The per-store daily customer count (i.e., the mean number of customers in a store in one day) for a nationwide convenience store chain that operates nearly 10,000 stores has been steady, at 900, for some time. To increase the customer count, the chain is considering cutting ...
*Thursday, January 30, 2014 at 9:32pm*

**public speaking**

Mandy interviewed a source who told about how she was illegally treated by the police. using her information in the speech is an example of: a. facts and statistics b. narrative c. testimony d. hypothetical example i chose b
*Wednesday, January 29, 2014 at 5:46pm*

**Statistics**

WEB CALCULATOR EXERCISE Descriptive Statistics 1 The table below presents data for a sample of people who completed a religious survey. Age Gender Denomination Church Attendance 56 1 7 4 46 2 6 5 49 2 6 5 49 1 1 5 27 2 9 5 51 1 4 2 47 2 2 3 67 1 5 4 49 2 2 6 33 1 12 6 55 2 9 5...
*Tuesday, January 28, 2014 at 8:56pm*

**bio statistics**

using descriptive statistics for weight gain, a friend of yours had a baby and gained approximately 30 pounds during pregnancy. Explain to her why she should not be too depressed over this occurrence.
*Tuesday, January 28, 2014 at 1:03pm*

**statistics**

Using the descriptive statistics for the weight of the babies in ounces suppose a friend of yours has given birth to a 10 pound 3 ounce baby. Is this unusual? why or why not?
*Tuesday, January 28, 2014 at 12:58pm*

**Statistics**

The variance of the mathematical scores of a sample of 21 high school girls was found to be 100 and that of a sample of 25 high school boys was 169. Test the hypothesis that the scores of the high school boys are more varying that those of the high school girls at alpha = 0.05...
*Monday, January 27, 2014 at 10:22am*

**Statistics **

What I mean by a "running number" is that the average is always changing. If I turn in 10 homework assignments and the grades are as follows: 58, 87, 99, 90, 92, 95, 89, 90, 95, 91 then my average is 88.6. If I turn in 10 more assignments my average changes, we don&#...
*Sunday, January 26, 2014 at 2:28pm*

**statistics**

A psychologist studied self esteem scores and found the sample data set to be normally distributed with a mean of 50 and a standard deviation of 5?
*Saturday, January 25, 2014 at 7:36pm*

**statistics**

when will I know it is time to calculate the mean? Is the mean a running number?
*Saturday, January 25, 2014 at 11:19am*

**Statistics**

In an essay of 250-500 words, thoroughly address the following items and respond to the related questions: 1.Define the term standard deviation. Why is it important to know the standard deviation for a given sample? What do researchers learn about a normal distribution from ...
*Thursday, January 23, 2014 at 4:00am*

**statistics**

do we need to calculate z in order to use the critical value like we did when we calculated the p value?
*Monday, January 20, 2014 at 3:30pm*

**statistics**

4 Find: a. The z score for each male salary, based on only the male salaries. b. The z score for each female salary, based on only the female salaries. c. The z score for each female compa, based on only the female compa values. d. The z score for each male compa, based on ...
*Sunday, January 19, 2014 at 11:24pm*

**statistics**

What is the probability for a: a. Randomly selected person being a male in grade E? b. Randomly selected male being in grade E? c. Why are the results different?
*Sunday, January 19, 2014 at 11:23pm*

**Statistics for Business**

Consider the GPA’s for the following 15 students 3.10, 3.20, 3.49, 2.68, 3.73, 3.39, 3.80, 3.11, 3.10, 3.10, 4.0, 3.89, 2.55, 4.0, and 3.75 a) Compute the max, min, Q1, median 3.9, Q3, IQR, and range 1.45 b) Using the variables from part a), construct a box plot for GPA. ...
*Sunday, January 19, 2014 at 8:25pm*

**Statistics for Business**

Consider the following sample of data: 11.2, 28.4, 32.6, 17, 13.5, 2.2, 38, 41.4, 1.9, 14.4, 21.8, 23.8 a) Calculate the max, min, Q1, median, and Q3 b) Calculate the average c) Calculate the standard deviation d) Calculate the variance
*Sunday, January 19, 2014 at 8:24pm*

**statistics**

A lottery uses 4 urns containing chips 0 to 9. One chip is selected at random from each urn. How many sample points are in the sample space?
*Saturday, January 18, 2014 at 11:24am*

**statistics**

. Consider a football team for whom the numbers on the active players’ jerseys are 29, 41, 50, 58, 79, and 10, (listed in order of the players’ names). Does it make sense to calculate the means of those numbers? Why or why not?
*Saturday, January 11, 2014 at 7:23pm*

**Statistics**

Students are being surveyed about the weight of books and supplies they are carrying as they attend class. a. Identify the variable of interest b. Identify the type of variable c. List a few values that might occur in a sample
*Saturday, January 11, 2014 at 4:52pm*

**Statistics**

Blossom’s Flowers purchases roses for sale for Valentine’s Day. The roses are purchased for $10 a dozen and are sold for $20 a dozen. Any roses not sold on Valentine’s Day can be sold for $5 per dozen. The owner will purchase 1 of 3 amounts of roses for ...
*Friday, January 10, 2014 at 9:55am*

**Statistics**

Hi * Suppose X has the pdf f(x)=(1/2)e^-|x| if -∞<x<∞ a)find the pdf of Y=|X|^3 b) Let W=0 if x<=0 and W=1 if x>1. Find cdf (cum.dist.func) of W.
*Friday, January 10, 2014 at 8:59am*

**Statistics**

hii. I have a question about pdf and cdf.. I couldn't solve it Please help me :/ 1) the pdf of the random var. X is given by f(x)= (3/8)(x+1)^2 if -1<x<1 0 if otherwise Find the pdf of a) Y=1-X^2 b) Y=1-X^2 ifx<=0 and Y=1-X if x>0
*Friday, January 10, 2014 at 8:57am*

**statistics**

You are interested in the weights of backpacks students carry to class and decide to conduct a study using the backpacks carried by 30 students. (a) Give some instructions for weighing the backpacks. Include unit of measure, accuracy of measure, and type of scale.
*Wednesday, January 8, 2014 at 9:23pm*

**statistics**

For a particular population, a sample of n = 4 scores has an expected value of 10. For the same population, a sample of n = 25 scores would have an expected value of ____. a. 4 b. 8 c. 10 d. 20
*Wednesday, January 8, 2014 at 7:34pm*

**statistics**

A sample from a population with = 40 and = 10 has a mean of M = 44. If the sample mean corresponds to a z = 2.00, then how many scores are in the sample? a. n = 100 b. n = 25 c. n = 5 d. n = 4
*Wednesday, January 8, 2014 at 7:33pm*

**statistics**

True Or False Using the average score to describe a sample is an example of inferential statistics. By reading the definition in my book I feel as though this phrase is false. Can someone please advise on this matter?
*Tuesday, January 7, 2014 at 10:49am*

**statistics**

True or False If one score is randomly selected from a normal distribution with = 100 and = 20, the probability of obtaining a score between X = 80 and X = 120 is 0.3413.
*Monday, January 6, 2014 at 2:00pm*

**statistics**

True or False For any normal distribution, the proportion corresponding to scores greater than z = +1.00 is exactly equal to the proportion corresponding to scores less than z = 1.00.
*Monday, January 6, 2014 at 1:57pm*

**Language Arts**

Anybody out there from 7th grade connections academy??! need help checking my answers!!: 1. The author's tone in this editorial is (1 point) sad humorous compassionate angry 2. What is the key phrase used to signal a comparison or contrast in the following statement? "...
*Saturday, January 4, 2014 at 6:46pm*

**Math**

I need assistance with statistics and probability. Can you some how assist me with that.?
*Friday, January 3, 2014 at 10:25pm*

**statistics**

True or False For a sample with M = 20 and s = 1, a score of X = 17 would be considered an extremely low score.
*Friday, January 3, 2014 at 8:33pm*

**statistics**

True or False A sample mean with a z-score value between 1.00 and +1.00 would be considered a fairly typical, representative sample.
*Friday, January 3, 2014 at 6:57pm*

**statistics**

true or false The value for the standard deviation cannot be larger than the value for the range.
*Friday, January 3, 2014 at 6:43pm*

**statistics**

True or False The class interval of 25-29 has real limits of 24.5 and 29.5.
*Wednesday, January 1, 2014 at 10:52pm*

**statistics**

A random sample of n = 4 scores is selected from a population with ƒÝ = 80 and ƒã = 20. On average, how much difference would you expect between the sample mean and the population mean? a. 0 points (the sample mean should be the same as the population ...
*Tuesday, December 31, 2013 at 8:51pm*

**statistics**

Last week Tom had exams in Math and in Spanish. He had a score of 45 on the Math exam and a score of 65 on the Spanish exam. For which class should Tom expect the better grade? a. Math b. Spanish c. The grades should be the same because the two exam scores are in the same ...
*Tuesday, December 31, 2013 at 8:07pm*

**statistics**

The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores. What is the variance for this population? a. 4 b. 5 c. 80 d. 100
*Tuesday, December 31, 2013 at 7:57pm*

**statistics**

Needing help to get this answer right. _c___ 3. What is the relationship between the alpha level, the size of the critical region, and the risk of a Type I error? a. As the alpha level increases, the size of the critical region increases and the risk of a Type I error ...
*Sunday, December 29, 2013 at 11:01am*

**statistics**

Needing some help to clarify this problem and help finding the right answer. _b___ 2. Which of the following accurately describes the critical region? a. outcomes with a very low probability if the null hypothesis is true b. outcomes with a high probability if the null ...
*Sunday, December 29, 2013 at 10:58am*

**statistics**

I really need help with my statistical analysis... i cant understand it. Here are the questions A sample group was surveyed to determine which of two brands of soap was preferred. H0 :p = 0.50; H1: p is not equal to 0.50. Thirty-eight of 60 people indicated a preference. At ...
*Friday, December 27, 2013 at 2:22pm*

**statistics**

A sample of n = 25 scores has M = 20 and s2 = 9. What is the sample standard deviation? a. 3 b. 4.5 c. 9 d. 81
*Thursday, December 26, 2013 at 7:00pm*

**statistics**

In a population of N = 10 scores, the smallest score is X = 8 and the largest score is X = 20. Using the concept of real limits, what is the range for this population? a. 11 b. 12 c. 13 d. cannot be determined without more information
*Thursday, December 26, 2013 at 6:59pm*

**Statistics**

A researcher measures eye color for a sample of n = 50 people. Which measure of central tendency would be appropriate to summarize the measurements? a. mean b. median c. mode d. any of the three measures could be used
*Wednesday, December 25, 2013 at 7:25pm*

**Statistics**

For a negatively skewed distribution with a mode of X = 25 and a median of 20, the mean is probably ____. a. greater than 25 b. less than 20 c. between 20 and 25 d. cannot be determined from the information given
*Monday, December 23, 2013 at 8:20pm*

**Statistics**

One item on a questionnaire asks, "How many siblings (brothers and sisters) did you have when you were a child?" A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately ...
*Monday, December 23, 2013 at 8:19pm*

**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, December 22, 2013 at 12:44pm*

**Statistics**

Can someone please help with this problem to advise how to set up and in the book Essential of Statistics for the Behavioral Sciences. A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n=25 third-...
*Friday, December 20, 2013 at 10:36pm*

**Statistics**

If the alpha level is changed from a=.05 to a=.01. a. What happens to the boundaries for the critical region? b. What happens to the probability of a Type I error?
*Friday, December 20, 2013 at 10:19pm*

**Statistics**

True or False In most research situations, the goal of a hypothesis test is to reject the null hypothesis.
*Friday, December 20, 2013 at 9:24pm*

**Statistics**

True or False The null hypothesis is stated in terms of the population, even though the data come from a sample.
*Friday, December 20, 2013 at 9:15pm*

**Statistics**

3. The formula for finding sample standard deviation is ________________. a.𝑠=∑1▒𝑥W22;𝑥 ̅^2 b.𝜎^2=(∑1▒(𝑋−𝜇)^2 )/𝑁 c.𝑠^2=(∑1▒(𝑋&#...
*Friday, December 20, 2013 at 7:14pm*

**statistics**

A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
*Friday, December 20, 2013 at 12:33pm*

**Statistics**

By definition, a Type I error is ____. a. rejecting a false H1 b. rejecting a false H0 c. rejecting a true H0 d. rejecting a true H1
*Friday, December 20, 2013 at 8:35am*

**Statistics**

Which of the following is an accurate definition of a Type II error? a. rejecting a false null hypothesis b. rejecting a true null hypothesis c. failing to reject a false null hypothesis d. failing to reject a true null hypothesis
*Friday, December 20, 2013 at 8:33am*

**Statistics**

What is the consequence of a Type II error? a. concluding that a treatment has an effect when it really does b. concluding that a treatment has no effect when it really has no effect c. concluding that a treatment has no effect when it really does d. concluding that a ...
*Friday, December 20, 2013 at 8:32am*

**MATH Statistics**

A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
*Friday, December 20, 2013 at 1:07am*

**statistics**

For these 90 times the mean was 15.60 minutes and the standard deviation s=1.80 minutes. Find the margin of error (round to 2 decimal places) and the 95% confidence interval for Julia’s average running time.
*Thursday, December 19, 2013 at 8:54pm*

**Statistics**

When is there a risk of a Type II error? a. whenever H0 is rejected b. whenever H1 is rejected c. whenever the decision is "fail to reject H0" d. The risk of a Type II error is independent of the decision from a hypothesis test.
*Thursday, December 19, 2013 at 4:01pm*

**Statistics**

Which of the following will increase the power of a statistical test? a. Change ƒÑ from .05 to .01. b. Change from a one-tailed test to a two-tailed test. c. Change the sample size from n = 100 to n = 25. d. None of the other options will increase power.
*Thursday, December 19, 2013 at 4:01pm*

**statistics **

Solve the problem. Round to the nearest tenth unless indicated otherwise. The amount of rainfall in January in a certain city is normally distributed with a mean of 4.3 inches and a standard deviation of 0.3 inches. Find the value of the quartile .
*Wednesday, December 18, 2013 at 5:44pm*

**probability & statistics**

Find the slope and the y-intercept for the line that passes through (-9,5) (11,12)
*Wednesday, December 18, 2013 at 4:33pm*

**Statistics**

A national opinion poll found that 44% of all American adults agree that parents should be given vouchers good for education at any public or private school of their choice. Suppose that in fact the population proportion who feel this way is p=0.44. A) Many opinion polls have ...
*Tuesday, December 17, 2013 at 7:24pm*

**statistics 3.**

A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
*Tuesday, December 17, 2013 at 5:23pm*

**statistics 4.**

The manufacturer of Porshe 918 Spyder car claims that their car can go from 0 mph to 60 mph speed in less than 2.5 seconds. To test this claim, a sample of 40 new cars of this type were driven and their average 0-60 mph time was 2.6 seconds with a standard deviation of 0.5 ...
*Tuesday, December 17, 2013 at 5:23pm*

**statistics 3.**

A student union wants to obtain a 90% confidence interval for the proportion of “full time” students who hold a part-time job for 20 hours or more per week. For this purpose, they want to interview a sample of full-time students. They want a margin of error to be at ...
*Tuesday, December 17, 2013 at 2:20pm*

**statistics 4.**

The manufacturer of Porshe 918 Spyder car claims that their car can go from 0 mph to 60 mph speed in less than 2.5 seconds. To test this claim, a sample of 40 new cars of this type were driven and their average 0-60 mph time was 2.6 seconds with a standard deviation of 0.5 ...
*Tuesday, December 17, 2013 at 2:19pm*