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Information collected at a local university indicates that students are working, on average (a value for m) 15.23 hours per week while in school. Information collected from a random sample of 25 fraternity members, however, reveals a mean of 12.34 hours per week with a standard deviation (s) of 2.50 hours. Assume that you're working at the .05 level of significance.
a. State an appropriate null hypothesis.
b. What is the value of the calculated test statistic (t)?
c. Identify the critical value.
d. State your conclusion.
Over the last 3 years, Art's Supermarket has observed the following distribution of modes of payment in the express lines: cash (C) 41%, check (CK) 24%.
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in developing a confidence interval for the population standard deviation ? we make use of the fact that the sampling
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The speed limit on Interstate 75 around Findlay, Ohio, is 65 mph. On a clear day with no construction, the mean speed of automobiles was measured at 63 mph with a standard deviation of 8 mph.
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Heights Of 10-year old boys, Weve established that heights of 10-year old boys vary according to Normal distribution with =138 centimeters and = 7 centimeters. What proportion is between 150 and 140 centimeters
Would you recommend test- ing H0 : m = 5 versus Ha : m> 5 or H0 : m= 5 versus Ha : m
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