Homework Sourse2 Independent simple random samples are selected from two no
2). Independent simple random samples are selected from two normal populations with equal variances. The sampling distriubtion of the ratio of the two sample variances is:
3). The value of F.05 distribution with 8 numerator degrees of freedom and 19 denominator degrees of freedom is:
4). The following hypothesis test is formed:
H0: o2= 20
H0: o2 does not equal 20
A sample of size n=41 provides a sample standard deviation of s =5 the test statistic is:
5). A sample size of 60 from population 1 provides a sample variance of 8 while a sample of 40 items from population 2 provides a sample variance of 10. You conduct a test of equality of the two population variances. The test statistic has a value of?
6). The 90% confidence interval estimate for a population standard deviation when a sample variance of 50 is obtained from a sample of 15 items is:
7). A sample of 51 items is selected to estimate a 95% confidence interval for the population variance. The chi-square values to be used for this interval estimation are:
8). The variance in wait time to check out at a retail store is 10 min. The store manager implements a new policy of single-line checkout and tests whether the new policy reduces wait time. the null hypothesis for this test is:
9). The fill amounts of a sample of 26 cans of apple juice show astandard deviationof 0.06 ounces. You test whether thepopulationvarianceis greater than 0.003. The p-value for this test is:
10). You want to determine whether the variance of sales at two music stores (A and B) are equal. A sample of 26 days of sales at store A provides a sample variance of 800 while a sample of 21 days of sales from store B provides a sample variance of 420.
11). Last year, the variance of the ages of the students at a small liberal arts college was 3.3 years. A recent sample of 81 students from the college provides a variance of 4.1 years. You test to see if there has been a change in the variance of the ages of the students at the college.You obtain a p-vaue of .067. At level of significance of .05, the null hypotheis should be
a.should be rejected
b. none of these answers are correct
c. should be revised
d. should not be rejected
Solution
2). Independent simple random samples are selected from two normal populations with equal variances. The sampling distriubtion of the ratio of the two sample variances is: the same
3 The value of F.05 distribution with 8 numerator degrees of freedom and 19 denominator degrees of freedom is:
2.48
A sample of size n=41 provides a sample standard deviation of s =5 the test statistic is:
50
5). A sample size of 60 from population 1 provides a sample variance of 8 while a sample of 40 items from population 2 provides a sample variance of 10. You conduct a test of equality of the two population variances. The test statistic has a value of?
1.25
7). A sample of 51 items is selected to estimate a 95% confidence interval for the population variance. The chi-square values to be used for this interval estimation are:
32.357 and 71.420
FOR THE OTHERS QUESTION I CAN GLADLY HELP YOU BUT YOU SHOULD POST IT IN A NEW QUESTION
