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In random samples of 25 from each of two normal populations, we found the following statistics:
X/mean=524 S1=129X/mean=469 S2=141
a. Estimate the difference between the two populations means with 95% confidence.b. Repeat part a, increasing the standard deviations to S1=255 and S2=260.c. Describe what happens when the sample standard deviations get larger.d. Repeat part a with sample of size 100.e. Discuss the effects of increasing the sample size.
Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
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The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month.
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