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If a statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 48.0 and 53.0 minutes what is the probability that a given class period runs greater than 51.25 minutes.
Findout the variance also standard deviation for the 2 distributions above. Evalute the variation of the data sets.
At the .01 significance level, can we conclude that there is more variation?
A sample of 64 Atlanta consumers showed a mean quarterly water bill of $51 with a sample standard deviation of $12. At α = .05, does the Atlanta sample support the conclusion that above-average rates exist for this private water system?
The null hypothesis is to be tested at the 10% level of significance. The critical value from the table is:
Illustrate the regression model and predict it. The following table shows the yearly maintenance costs for several cars, as well as their age.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
What proportion of sample means would be between 1.31 and 1.33 inches?
In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the following data have been gathered.
For each of the following situations, indicate the appropriate measure, incidence rate or prevalence rate and the numerical value of the rate.
Probability using discrete distribution.The probability distribution for the random variable x follows.
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4 X with an r 2 of .67
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