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The amount of time required for an oi and filter change on an automobile is normally distributed with a mean of 45 minutes and a standard deviation of 10 minutes. A random sample of 16 cars is selected. What is the probability that the sample mean is between 45 and 52 minutes.
The monthly sales volume (in thousands of dollars) for a manufacturer of snow skis is seasonal (there tend to be more skis sold during fall and winter months than during warmer months). The following table shows the monthly seasonal indexes for th..
Using a one-sided hypothesis test with a 90% confidence level, which of the following statements do these data support?
At the .05 significance level, is there a difference in the mean number of calls per day between the two employees?
A cereal manufacturer seeks to test their newest product against competitor's. A group of 100 children was asked to measure each brand, and then to express a preference.
Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.
Below are one hundred pseudorandom numbers from a uniform pdf. Set up and test the appropriate goodness-of-fit hypothesis. Let α = 0.05.
How large a sample is needed to find the population mean within $250 at 99 percent confidence?
In a simple random sample of 1000 households, 150 households happen to own a barbecue grill. Based on the characteristics of the population, the expected number of grill owners in the sample was 180.
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
Then test to see whether it considerably varies from 0 [use alpha = 5%]. Don't forget to identify the null and alternative hypotheses.
Use a significance level of alpha = .05 to test the claim that p > .5. The sample is a simple random sample n = 50. Show how to calculate beta for the test and assume the true population proportion is .6.
What is the probability of randomly selecting a person who is conservative and then selecting from that group someone who is a nursing major?
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