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Let x be a random variable that represents the commute time of teachers in a large urban area. If x is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes, find the commute time which is at the top of the bottom 25%.
A. 40.12 minutes
B. 41.38 minutes
C. 42.63 minutes
D. 43.81 minutes
What is the likelihood the sample mean is greater than $22.50 but less than $25.00?
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group, (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class.
Use a two proportion z-test to perform the required hypothesis test. State the conclusion.
Give an example of a hypothesis test. State what the Null and the Alternative hypotheses.
About what percent of the observations lie between 55 and 65?
Describe a study you might design that could use the Chi Square statistic. What are the variables? What are the null and alternative hypotheses? Why would the Chi Square test be appropriate for this design?
What does the coefficient of determination tell you about the variation in attendance and the variation in the number of exhibitors?
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
In a random sample of 53 concrete specimens, the average porosity (in percent) was 21.6 and the standard deviation was 3.2. a) Find a 90% confidence interval for the mean porosity of specimens of this type of concrete.
Standard deviation of 7. At 0.01 significance level, is there more variation in first population?
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