Quiz Multiple choice - Statistics Project Example

Review Assessment: MATU203Wk5 User Tina Miller Submitted 2/7/12 12:01 PM MATU203Wk5 Status Completed Score 19 out of 19 points   Instructions    Question 11 out of 1 points  Provide an appropriate response.In the context of a hypothesis test for two proportions, which of the following statements about the pooled sample proportion, ,  true?Selected Answer:   I and III   Question 22 out of 2 points  Provide an appropriate response.In a random sample of 500 people aged 20-24, 22% were smokers.

In a random sample of 450 people aged 25-29, 14% were smokers. A 95% confidence interval for the difference between the proportion of 20-24 year olds and the proportion of 25-29 year olds who are smokers is  Which of the following statements give a correct interpretation of this confidence interval?I. We can be 95% confident that the interval 0.032 to 0.128 contains the true difference between the two population proportions.II. There is a 95% chance that the true difference between the two population proportions lies between 0.032 and 0.128.III. If the process were repeated many times, each time selecting random samples of 500 people aged 20-24 and 450 people aged 25-29 and each time constructing a confidence interval for p1 - p2, 95% of the time the true difference between the two population proportions will lie between 0.032 and 0.128.IV. If the process were repeated many times, each time selecting random samples of 500 people aged 20-24 and 450 people aged 25-29 and each time constructing a confidence interval for p1 - p2, 95% of the time the confidence interval limits will contain the true difference between the two population proportions.

Selected Answer:   I and IV   Question 32 out of 2 points  Find the number of successes x suggested by the given statement.Among 620 adults selected randomly from among the residents of one town, 18.9% said that they favor stronger gun-control laws.Selected Answer:   117   Question 42 out of 2 points  Find the number of successes x suggested by the given statement.Among 660 adults selected randomly from among the residents of one town, 30.2% said that they favor stronger gun-control laws.

Selected Answer:   199   Question 52 out of 2 points  Assume that you plan to use a significance level of  = 0.05 to test the claim that p1 = p2, Use the given sample sizes and numbers of successes to find the pooled estimate . Round your answer to the nearest thousandth.Selected Answer:   0.385   Question 62 out of 2 points  Solve the problem.The table shows the number satisfied in their work in a sample of working adults with a college education and in a sample of working adults without a college education.

Assume that you plan to use a significance level of  = 0.05 to test the claim that  Find the critical value(s) for this hypothesis test. Do the data provide sufficient evidence that a greater proportion of those with a college education are satisfied in their work?Selected Answer:   z = 1.645; no   Question 72 out of 2 points  Construct the indicated confidence interval for the difference between population proportions  Assume that the samples are independent and that they have been randomly selected.

x1 = 39, n1 = 61 and x2 = 49, n2 = 81; Construct a 95% confidence interval for the difference between population proportions p1 - p2.Selected Answer:   -0.126 < p1 - p2 < 0.195   Question 82 out of 2 points  Construct the indicated confidence interval for the difference between population proportions  Assume that the samples are independent and that they have been randomly selected.x1 = 36, n1 = 64 and x2 = 47, n2 = 71; Construct a 95% confidence interval for the difference between population proportions p1 - p2.

Selected Answer:   -0.263 < p1 - p2 < 0.064   Question 92 out of 2 points  Construct the indicated confidence interval for the difference between population proportions  Assume that the samples are independent and that they have been randomly selected.x1 = 59, n1 = 122 and x2 = 74, n2 = 125; Construct a 98% confidence interval for the difference between population proportions p1 - p2.Selected Answer:   -0.255 < p1 - p2 < 0.039   Question 102 out of 2 points  Solve the problem.

The sample size needed to estimate the difference between two population proportions to within a margin of error E with a confidence level of 1 -  can be found as follows: in the expressionreplace n1 and n2 by n (assuming both samples have the same size) and replace each of p1, q1, p2, and q2 by 0.5 (because their values are not known). Then solve for n.Use this approach to find the size of each sample if you want to estimate the difference between the proportions of men and women who plan to vote in the next presidential election.

Assume that you want 99% confidence that your error is no more than 0.05.Selected Answer:   1327Review Assessment: Quiz 6UserTina MillerSubmitted2/7/12 12:59 PMNameQuiz 6StatusCompletedScore20 out of 20 points  Instructions   Question 12 out of 2 points  A researcher reports an F-ratio with df= 3, 36 from an independent-measures research study. Based on the df values, how many treatments were compared in the study and what was the total number of subjects participating in the study?Selected Answer:   4 treatments and 40 subjects   Question 22 out of 2 points  A research obtains an F-ratio of F = 4.

00 from an independent-measures research study comparing 2 treatment conditions. If the researcher had used an independent-measures t statistic to evaluate the data, what value would be obtained for the t statistic?Selected Answer:   t = 2   Question 32 out of 2 points  In an analysis of variance, which of the following is directly influenced by the size of the sample mean differences?Selected Answer:   SS between treatments   Question 42 out of 2 points  In general, the largest F-ratio will be obtained when the differences between sample mean are _________ and the magnitudes of the sample variances are ______.

Selected Answer:   large, small   Question 52 out of 2 points  An independent-measures research study compares three treatment conditions using a sample of n = 5 in each treatment. For this study, the three samples totals are, T1 = 5, T2 = 10, T3 = 15. What value would be obtained for SS between?Selected Answer:   10   Question 62 out of 2 points  An independent-measures research study compares three treatment conditions using a sample of n = 10 in each treatment. For this study, the three samples have SS1 = 10, SS2 = 20, and SS3 = 15.

What value would be obtained for MS within?Selected Answer:   45/27   Question 72 out of 2 points  Under what circumstances are post tests necessary?Selected Answer:   When you reject the null hypothesis with more than 2 treatment conditions   Question 82 out of 2 points  SourceSSdfMS Between Treatments12ABF = 2.00Within TreatmentsCDE TotalFG  What is the numeric value for B (i.e., MS between treatments)?Selected Answer:   4   Question 92 out of 2 points  SourceSSdfMS Between Treatments12ABF = 2.

00Within TreatmentsCDE TotalFG  What is the numeric value for C (i.e., SS within treatments)?Selected Answer:   32   Question 102 out of 2 points  SourceSSdfMS Between Treatments12ABF = 2.00Within TreatmentsCDE TotalFG  What is the numeric value for E (i.e., MS within treatments)?Selected Answer:   2