Question

MULTIPLE CHOICE Circle the correct answer. (2 points each) 1. A simple random sample of six patients over the age of 65 is being used in a blood pressure study. The standard error of the mean blood pressure of these six men was 22.8. What is the standard deviation of these six blood pressure measurements? a. 9.31 b. 50.98 c. 55.85 d. 136.8 e. None of the above c a. b. c. 2. A 95% CI for the ratio of two independent population variances is given to be (0.5,1.75). What decision would be made for a two-tailed hypothesis test with Ho: 0,? = 0, assuming a 5% significance level? Fail to Reject Ho Reject Ho Statistically significant d. Not enough information 3. A 95% confidence interval for the ratio of the two independent population variances is given as (0.99,1.8). Which test of the equality of means should be used? a. Pairedt b. Pooledt c. Separatet . Z test of proportions c. Not enough information 4. To assess the accuracy of a laboratory scale, a standard weight that is known to weigh exactly 1 gram is repeatedly weighed a total of times and the mean is computed. Suppose the scale readings are Normally distributed with an unknown mean of and a standard deviation of [=0.01 grams. How large should be so that a 95% confidence interval for has a margin of error no larger than +0.0001? Jan 100 lb. 196 C-10000 d38416 e. None of the above

Answer 1

1. Here SE=22.8 and n=65

As $SE=\frac{\sigma }{\sqrt{n}}$

So

0 = SE* n = 22.6* V65 = 182.21

Hence the correct answer here is

e. None of the above