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In looking at your business, when and why would you want to use a one-sample mean test (either z or t) or a two-sample t-test? Create a null and alternate hypothesis for one of these issues. How would you use the results?
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
Use this information to determine the empirical probability that the next bird to visit the feeding station will be a dove.
Is the sample size large enough to construct a valid confidence interval for the proportion of debit cardholders who have used their card in making purchases over the Internet?
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
The F-test cannot be used to answer whether or not there is a significant difference between the means.
Estimating the combined mean values for the given data - find the mean for the combined sample
How does the bell-shaped curve for the sampling distribution of sample means for samples of size n = 100 compare to the bell-shaped curve for sampling distribution of sample means for samples of size n = 60.
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
Based on our poll what is the margin of error of the proportion of voters favoring the incumbent?
What is the probability that the cereal would be high calorie? In other words, what is P (high calorie)?
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