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The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow the normal distribution. The battery was recently modified with the objective of making it last longer. A sample of 20 of the modified batteries had a mean life of 311 days with a standard deviation of 12 days. Did the modification increase the mean life of the battery?
a. State the null hypothesis and the alternate hypothesis.
b. Show the decision rule graphically. Use the .05 significance level.
c. Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.
Linear programming problems. Computethe following linear programming problem. Among which of the following points (X,Y) is feasible.
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
Find out whether this is enough evidence to accept or reject manager's null hypothesis, using alpha = .01. Is this test left-tailed, right-tailed or two-tailed?
Visits to Web sites. What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take first place, but about 50 percent of male Internet users in this age group visit an auction site such as eBay at least once a month. Inte..
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
Based on surveys conducted in 1989 and 1999, a researcher compared the proportion of high school age females interested in a career in science in 1989 with the proportion in 1999. He concluded that the proportions were not significantly different ..
One use of the Chi-square goodness of fit test is to determine if specified multinominal probabilities in the null hypothesis is correct.
If Kim expects to use phone for 21 hours per month, which plan must she choose?
Standard deviation of 7. At 0.01 significance level, is there more variation in first population?
What can we conclude from this summary, Which of the following statements is correct and In which of the following situations would permutation tests be suitable
What is the best estimate of the average tread life in miles for the entire population of these tires?
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
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