1. The manufacturer of a battery for an electric automobile advertised that it would power the car for 7.5 hours without a recharge( = 7.5). In a test of the claim, ten cars(N = 10)were driven until the battery gave out producing the statistics that follow:

Sample Mean(X-bar) = 7.40hours; Sample Standard Deviation(s-hat)= .20

A. Conduct a One-Sample t Test (alpha = .05; 2-tailed test).

• state the null and alternative hypothesis
• conduct the t-Test and include the critical t values
• what is the decision and summary of this problem including the p-value.

B. Calculate a 95% Confidence Interval

2. The Rathus Assertiveness Schedule is a 30-item questionnaire. The mean score for women on this instrument is8

( =8). Suppose that the unit of your college that is in charge of personal development conducted a six-week course in assertiveness and at the end of the course the following scores were obtained from the 10 women(N=10)who completed the course.

Data Set1

203604416-65028248

A.) Calculate a 95% Confidence Interval

B.) Conduct a One Sample t Test (alpha = .05; 2-tailed test).

• state the null and alternative hypothesis
• conduct the t-Test and include the critical t values
• what is the decision and summary of this problem including the p-value.