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The following data represent the running times of random samples of films produced by 2 motion-picture companies:
Company Time (minutes)A 102 86 98 109 92B 81 165 97 134 92 87 114
At the 1% level of significance, test the hypothesis that the average running time of films produced by Company A is less than that of Company B. Assume the distributions of running times at both companies are roughly normal.
Note: An unpooled variance t-statistic, if appropriate, would have 7 degrees of freedom.
(a) State the null and alternative hypotheses.(b) Calculate the value of an appropriate test statistic.(c) Construct the rejection region.(d) What do you conclude? (Interpret your result.)
Having a difficult time finding a health care article that pertains to correlation statistical procedures. I am not even sure what that means.
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You should use the hypergeometric distribution because you are sampling a small population without replacement.you are sampling a large population without replacement. You are sampling a small population with replacement.
How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?
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he life expectancy of a brand of hair dryer is normally distributed wiht a mean of four years and a standard deviation of 8 months.
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