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Probability using Z - score. The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Assume a sample of 60 Americans is taken to further investigate viewing habits. Suppose the population standard deviation for weekly viewing time is Q = 4 hours.
a) What is the probability sample mean within 1 hour with of the population mean?
b) What is the probability sample mean will be within 45 minutes of the population mean?
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
The lengths of pins produced by a machine follow a normal distribution with mean 2.54 cm and standard derivation 0.04 cm.
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
A concessionaire for the local ballpark has made a table of conditional values for the different alternatives also states of nature
Using the confidence interval when conducting a two-tail test for the population mean we do not reject the null hypothesis if the hypothesized value for:
The accompanying two histograms represent the distribution of acceptance rates (percent accepted) among 25 business schools in 1995. The histograms use different class intervals, but are based on the same data. In each class interval, the left endpoi..
What is the possibility that for a arbitrarily selected customer the service time could exceed 3 minutes?
Compare the two forecasts computed in (a) and (b), using MAD. Which one should the dealer use for January of the next year?
If a single test is run and indicates that oil is present, what is the revised probability that oil is actually present?
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Interpret the correlation between each set of variables.
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