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Consider the following hypotheses test.
Ho: m ³ 80 Ha: m
A sample of 121 provided a sample mean of 77.3. The population standard deviation is known to be 16.5.
a. Compute the value of the test statistic.
b. Determine the p-value; and at 93.7% confidence, test the above hypotheses.
c. Using the critical value approach at 93.7% confidence, test the hypotheses.
For which of given variables must a "two tail" t-test be applied?
X has a normal distribution with a mean of 80.0 and a standard deviation of 3.5. Find the following probabilities.
Approximately 65% of all marketing personnel are extroverts, whereas about 50% of all computer programmers are introverts.
For a given level of significance, if the sample size is increased: the power of the test will increase we will have more responses to log and calculate it will skew the mean to the right it has no effect on the direct results.
Suppose that beer consumption and religious affiliation are not independent of each other. That means that
At the .05 significance level, can we conclude that the guideline is still reasonable?
The normal distribution has several characteristics that make it the underlying foundation of much of inferential statistical tools.
According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $63,091 and the median household income was $50,054.
Twenty three percent of automobiles are not covered by insurance. On a particular weekend, 35 automobiles are involved in accident.
Make up a scatter diagram with 10 dots for each of the following:
An auto manufacturer advertises that "90% of the cars we've ever made are still on the road." Assuming this is literally true, how can it be explained? What facts/statistics would you need to know to expose this misleading claim?
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
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