A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard deviation of $2.14. The means appear to be very close, bu

Suppose that on a 100-point test, the goal is for the students' exam scores to have a standard deviation of less than 10 pts. A recent sample of 22 exams has a standard deviation of 12.1. Use alpha = 0.05.
H0: population variance > or = 100
H1: population variance < 100
What is the critical Chi-square value?
For the same

Question 5
Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected
A machine dispenses a liquid drug into bottles in such a way that the standard deviation of the contents is 81 milliliters. A new machine is tested on a sample

The following hypothesis are given.
H0: σ2/1 ≤ σ2/2
H1: σ2/1 > σ2/2
A random sample of five observations from the first population resulted in a standard deviation of 12. A random sample of seven observations from the second population showed a standard deviation of 7. At the .01 significance level

I'm working on a project that deals with the impact of age on helicopter pilots and want to see if that after age 40 accidents occur more frequently. I would like to use a T test to test this but an unsure how to go about doing it.
I think the hypothesis would be:
H1: Accidents occur more frequently above the age of 40.
H0:

Consider the following hypothesis test:
H0: u>= 1.25
Ha: u< 1.25
A sample of 49 provides a sample mean of 1.19 and a previous population standard deviation of 0.14. Answer the following questions:
a. At a=0.01, what is the critical value?
b. Compute the value of the test statistic t.
c. What is the p-value?
d.

Use the data below to answer the determine varianceand standard deviation. (note: carry your calculator out to 4 decimal places).
Year Actual Return Average Return Deviation for the Mean Squared Deviation
1 .12 .103 .017

A sample of scores on an examination given to both males and females in QNT 575 are:
Males - 72,69,98,66,85,76,79,80,and 77
Females - 81,67,90,78,81,80, and 76
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
I need a step by step calculation of the problem.

We have two different samples - consisting of bags of M&M's.
The first sample consists of 5 bags of M&M's with the following number of blue pieces in each bag 10, 11, 9,10,10.
Calculate:
A. The mean
B. The standard deviation
C. The variance
The second sample consists of 10 bags with an average number of blue