statistics
posted by Jeniffer .
A maintenance supervisor is comparing the standard version of an instructional booklet with one that has been claimed to be superior. An experiment is conducted in which 26 technicians are divided into two groups, provided with one of the booklets, then given a test a week later. For the 13 using the standard version, the average exam score was 72.0, with a standard deviation of 9.3. For the 13 given the new version, the average score was 80.2, with a standard deviation of 10.1. Assuming normal populations with equal standard deviations, and using the 0.05 level of significance, does the new booklet appear to be better than the standard version?

Ho: Standard = Superior
H1: Standard < Superior (onetailed test)
Get Z score for difference between means
Z = (mean1  mean2)/ Standard Error of Difference between means
SE of Difference = Sq root (SD1^2 + SD2^2)
See if Z score has less than .05 in smaller area in table at back of your Stats Text labeled something like "areas under normal distribution."
I'll let you do the calculations and make the decision.
I hope this helps. Thanks for asking.
Respond to this Question
Similar Questions

Physic please help!
A wavelength of 625 nm is used in a Young's doubleslit experiment. The separation between the slits is d = 1.3 105 m. The total width of the screen is 0.20 m. In one version of the setup, the separation between the double slit and … 
physics
does anyone know who conducted the experiment or a credible description of the experiment that helped prove Einstein's thought experiment: the twin paradox? 
biology can someone check
Decide if each of the following statements is true.If it is not rewrite the parentheses part to make it true. 1) Scientific methods include observation,(forming a hypothesis, and experiment). ans: false ;answer questions; solve problems … 
STATISTICS
A statistics professor conducted a study on the effect of playing video games on a student’s test scores. On the first day of class, she randomly divided her classes into groups. Group one played video games 2 hours a day, group … 
SICAT.CES NCIII
Study Case Your electronic business has just been selected as the center and wholesaler of a china brand of washing machine appliances. You are the manager at the same time supervisor and firm’s owner. You need to develop and oblige … 
Biology
1. A medical scientist is designing an experiment to test the results of a new drug that she hypothesizes will greatly reduce and possibly eliminate the side effects of a new cancer treatment. If this experiment is to be set up correctly, … 
English
I am psueo conducting an experiment on 144 freshmen high school students who are evenly divided into 6 groups. The treatment group are receiving a new instructional strategy that the control group is not receiving. A ttest was conducted … 
math
The integers from 1 through 10 (inclusive) are divided into three groups, each containing at least one number. These groups satisfy the additional property that if x is in a group and 2x≤10, then 2x is in the same group. How … 
math
The integers from 1 through 10 (inclusive) are divided into three groups, each containing at least one number. These groups satisfy the additional property that if x is in a group and 2x≤10, then 2x is in the same group. How … 
maths
The integers from 1 through 10 (inclusive) are divided into three groups, each containing at least one number. These groups satisfy the additional property that if x is in a group and 2x≤10, then 2x is in the same group. How …