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a. Why researchers are interested in describing measures of the center and measures of variation of a data set?
b. What is an "arithmetic mean" ? Does it have the same meaning as the word "average"?
c. The average of data set is influenced by extreme values while the median is not. In other words, the median is not resistant to outliers but the average is not.
d. The range is the most obvious measure of variability or spread out of values in a data set but it is not the best measure compared to standard deviation.
e. Interpret the meaning of "standard deviation" if the standard deviation of a set of numbers is 2 and the arithmetic mean is 3.
A manufacturer claims that the mean lifetime,M , of its light bulbs is 51 months. The standard deviation of these lifetimes is 9 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 53 months.
Test the hypothesis that the drug reduced the chance of a bad result compared to the placebo using a significance level of 0.05.
suppose that the probability that a duck hunter will successfully hit a duck is 0.40 on any given shot. suppose also
Develop a scatter diagram and discuss about the casual relationship between those two variables by observing the overall trend of your plots of coordinates
Use the formula of Exercise 29 to calculate a 95% confidence interval for β for the numbers of hours studied and the test scores in the table in Section 3 and compare this interval with the one obtained in Example 6.
What are the 3 required assumptions for the appropriate use of the independent grp.T-test?
She samples a group of 100 new fathers and finds that their mean is 64.5. What is the variance on this questionnaire in the general population?
More precipitation for May is 12. Question: What is the probability that Rapid City has 18 days with .01 inch or more precipitation next May?
Do the data give convincing evidence of a difference in the proportions of all teens and young adults who would say that they own an iPod or MP3 player?
Suppose a stock analyst wants to determine whether there is a difference in the mean rate of returns for three types of stock - utility, retail, and banking.
Assignment 1 "Identify the primary criterion used in selecting a normal distribution vs. a "t" distribution as the appropriate sampling distribution of means."
Determine (a) the 90% confidence limits, and (b) the 97% confidence limits for an estimate of the mean diameter of all the rivets produced by the machine in a day.
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