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A business major wants to determine whether the variation in advertising costs of hair salons is different from the variation in advertising costs of nail salons. He surveys several businesses and finds the standard deviation in monthly advertising costs is $23 for 12 hair salons, and $43 for 8 nail salons.
Part 1. What is the appropriate distribution for such data? Part 2. Is this lot anomalous?
What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
Inverse probability based on normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
What is the predicted GPA if a person watches 12 hours of television per week?
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
What is the probability of finding a sheet chosen at random which contains 3 or more surface flaws and find the greatest standard deviation,
Compute a 95% confidence interval for the mean difference in the percentage of bone loss between two groups.
Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
A sample of 50 provided a sample mean of 14.15. The population standard deviation is 3.
You construct a 90% confidence interval for the average stock price to be (267.348, 279.472). Of the following choices, what is the approporiate interpretation of this interval?
Sketch a curve, point out the distribution (i.e., normal , student T, Chi square), critical region(s). test statistics, critical values(s) and n p-value?
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