The following table shows the results of two random samples that measured the average number of minutes per charge for AA Lithium ion (Li ion) rechargeable batteries versus Nickel– Metal Hydride (NiMH) rechargeable batteries:

a. Perform a hypothesis test using α = 0.10 to determine if the average number of minutes per charge differs between these two battery types. Assume the population variances for the number of minutes per charge are not equal.

b. Approximate the p value using Table 5 in Appendix A and interpret the results.

c. Determine the precise p value using Excel.

d. Verify your results using PHStat.

e. What assumptions need to be made in order to perform this procedure?

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Sample mean Sample standard deviation Sample size Li-ion 96.5 6.5 14 NiMH 82.9 11.2 18