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The average U.s. daily internet use at home is two hours and twenty minutes. A sample of 64 homes in soddy daisy showed an average usage of two hours and 50 minutes with a standard deviation of 80 minutes. We are interested in determining whether or not the average usage in soddy-daisy is significantly different from the U. S. average.
a) State the null and alternative hypotheses to be tested.
b) Compute the test statistic.
c) the null hypothesis is to be tested at 95% confidence. Determine the critical value(s) for this test.
d) What do you conclude?
For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
Determine the probability that person selected has blood type O? Given that person selected is a male, determine the probability that their blood type is AB?
Using α = .05 test for significance differences among the population mean wasted time for theses three urban areas. What is the p-value? What is your conclusion?
For each of the F statistics given above find the degrees of freedom and an approximate P-value. Summarize the results of these tests.
Roll a die and record the count of spots on the up face: P(1) = 0, P(2) = 1/6, P(3) = 1/3, P(4) = 1/3, P(5) = 1/6, P(6) = 0.
If you draw two balls without replacing the first one, what is the possibility that one ball is red and the other is white.
Make your calculation supposing a two-sided two-sample t-test with a type I error (alpha) of 0.056
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
what is the probability of obtaining at least 6 cases in this class if the nationwide rate holds True?
If the mean lifetime of this type of component is 100 hours and its standard deviation is 19 hours, how many of these component must be in stock so that the probability of the system is in continual operations for the next 2,000 hours is at least ..
To evaluate average annual expenses of students on books and class materials sample size 36 is taken.
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