Question

11) You are testing the claim that the proportion of men who own cats is significantly different than the proportion of women who own cats.
You sample 180 men, and 30% own cats.
You sample 100 women, and 70% own cats.
Find the test statistic, rounded to two decimal places.

12) You are testing the claim that the mean GPA of night students is different than the mean GPA of day students.
You sample 60 night students, and the sample mean GPA is 2.01 with a standard deviation of 0.53
You sample 30 day students, and the sample mean GPA is 1.75 with a standard deviation of 0.74
Calculate the test statistic, rounded to 2 decimal places

20) Give a 98% confidence interval, for μ1-μ2 given the following information.

n1=35, ¯x1=2.69, s1=0.47
n2=25, ¯x¯2=2.42, s2=0.99

___ < μ1-μ2 < ___ Use Technology Rounded to 2 decimal places.

Answer 1

11)

12)

20)

Using excel, following is required confidence interval:

-0.25 < μ1-μ2 < 0.79