7. A sociologist wishes to conduct a poll to estimate the percentage of Americans who favor affirmative action program for women and minorities for admission to colleges and universities. What sample size should be obtained if he wishes the estimate to be within 0.032 with 98% confidence if; a. He uses a 2008 estimate of 63.5% ? b. He does not use any prior estimate?

5. A loan in which the lender receives a percentage of the net operating income from the property is known as a(n)?

A) Participation loan

(B) Accrual loan

(C) Convertible loan

(D) Percentage loan

Suppose the manager of a shoe store wants to determine the current percentage of customers who are males. How many customers should the manager survey in order to be 92% confident that the estimated (sample) proportion is within 10 percentage points of the true population proportion of customers who are males?

The Centers for Disease Control reported the percentage of people 18 years of age and older who smoke (CDC website, December 14, 2014). Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .27.

a. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02 (to the nearest whole number)? Use 95% confidence.

b. Assume that the study uses your sample size recommendation in part (a) and finds 520 smokers. What is the point estimate of the proportion of smokers in the population (to 4 decimals)?

c. What is the 95% confidence interval for the proportion of smokers in the population (to 4 decimals)? ( ? , ? )

What is meant by homogeneity of powdered sample? How will this affect percentage purity of KHP?

19. Claim: The percentage of people aged 18-30 that will vote for Candidate A is less than the percentage of people aged 50-70 that will vote for Candidate A. Test at α = 0.05

Data: 150 random 18-30 year old people are asked, and 100 of them say they will vote for Candidate A. 200 random 50-70 year old people are asked, and 150 say they will vote for Candidate A.

(a) Are these data statistically significant evidence to support the claim?

(b) Are these data statistically significant evidence to refute the claim?

For a certain year a study reports that the percentage of college students using credit cards was 87%. A college dean of student services claims that this is too high for her university, so she randomly selects 50 students and finds that 40 of them use credit cards. At  = 0.10 is she correct?

State:__________________________________ CV: use table E, F, G, CV=___________________ TV: z, t, or 2  (circle one), TV=________________ Decide:________________________________ Summary: (remember to circle the correct description before completing the statement) There is/is not enough evidence to reject/support the claim that______________________ ________________________________________________________________________ _______________________________________________________________________

10% of all college students volunteer their time. Is the percentage of college students who are volunteers smaller for students receiving financial aid? Of the 339 randomly selected students who receive financial aid, 17 of them volunteered their time. What can be concluded at the αα = 0.01 level of significance?

For this study, we should use Select an answer t-test for a population mean z-test for a population proportion

The null and alternative hypotheses would be:   

H0:H0:  ? p μ  Select an answer < > = ≠   (please enter a decimal)   

H1:H1:  ? p μ  Select an answer ≠ < = >   (Please enter a decimal)

The test statistic ? z t  =  (please show your answer to 3 decimal places.)

The p-value =  (Please show your answer to 4 decimal places.)

The p-value is ? > ≤  αα

Based on this, we should Select an answer reject accept fail to reject  the null hypothesis.

Thus, the final conclusion is that ...

The data suggest the populaton proportion is significantly lower than 10% at αα = 0.01, so there is sufficient evidence to conclude that the percentage of financial aid recipients who volunteer is lower than 10%.

The data suggest the population proportion is not significantly lower than 10% at αα = 0.01, so there is sufficient evidence to conclude that the percentage of financial aid recipients who volunteer is equal to 10%.

The data suggest the population proportion is not significantly lower than 10% at αα = 0.01, so there is insufficient evidence to conclude that the percentage of financial aid recipients who volunteer is lower than 10%.

1. Before the rush began for Christmas shopping, a department store had noted that the percentage of its customers who use the store's credit card, the percentage of those who use a major credit card, and the percentage of those who pay cash are the same. During the Christmas rush in a sample of 150 shoppers, 46 used the store's credit card; 43 used a major credit card; and 61 paid cash. With a = 0.05, test to see if the methods of payment have changed during the Christmas rush.

1. Fill in the table below

2. Determine the degrees of freedom

3. Compute the test statistic

4. Perform the test to see if the methods of payment have changed