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An important feature of tales is vattery life, the number of hours before the battery needs to be recharged. The file Tablets contains the battery life of 12 WiFi-only and 7 3G/4G/WiFi 9 through 12-inch tablets.
a. Assuming that the population variances from both types of tablets are equal, is there evidence of a difference in the mean battery life between the two types of tables? (Use a=0.05)
b. Determine the p-value in (a) and interpret its meaning.
c. Assuming that the population variances from both types of tablets are equal, construct and interpret a 95% confidence interval estimate of the difference between the population mean battery life of the two types of tablets.
a health researcher read that a 200-pound male can burn an average of 524 calories per hour playing tennis. 37 males
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Let X be a normal distributed random Variable with u=100 and o=10. the probability that X is between 70 and 100 is:
His sample size was 50,000. His method worked better than the Digest"s method. He predicted the correct winner, but was still off by 6 percentage points. How did he predict the Digest prediction so well?
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Find the weighted mean if each three-hour course counts for 18%, and each four-hour course counts for 23% of her final semester score.
a student has computed that it takes an average mean of 16 minutes with a standard deviation of 3 minutes to drive from
determine the sample size needed to construct a 95 confidence interval to estimate the population mean for the
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