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A student population consists of 55% females and 45% males. A researcher recorded the gender of each student emerging from a theater and found a total of 385 females and 215 males. Is the gender distribution for theater goers significantly different from the distribution for the general college. Test at .05 leve of significance.
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
The ANOVA summary table below is the result of a regression of sales on year of sales. Is the relationship statistically significant at .05? Comment.
Set up the null and alternative hypotheses, and perform the hypothesis test with a significance level of 0.05.
The times for 300 college students of introductory statistics to complete a one-hour times exam.
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
The mean time to download an Google video is 1 minute 30 seconds. Suppose the download time is normally distributed with standard deviation of 20 seconds.
The amounts dispensed by a cola machine follow the normal distribution with a mean of 7 ounces and a standard deviation of 0.10 ounces per cup.
Compute the within group variability. Do you require any post hoc testing? Why or why not? Decribe in detail.
Assume that a single radar unit used to detect incoming missiles has a probability of 0.90 of correctly detecting an incoming missile attack.
A large discount chain compares the performance of its credit managers in Ohio and Illinois by comparing the mean dollar amounts owed by customers with delinquent charge accounts in these two states.
Think of your favorite casino game (craps, black-jack, roulette, etc) and analyze the probabilities of a few different outcomes.
Two letters are chosen at random without replacement from word statistical. Determine the probability that both letters are s?
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