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The number of sit-ups that a person can do in one minute, both before and after a physical fitness course was recorded. The data is shown below for 10 randomly selected participants.
Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume variable is normally distributed. Test using alpha = 0.01.
Before 30 23 25 29 27 25 30 45 34 26
After 31 27 25 35 34 35 32 52 50 43
A genetic experiment with peas resulted in one sample of offspring that consisted of 438 green peas and 159 yellow peas.
How would you explain the analysis of variance, assuming that your audience has not had a statistics class before?
Sample with size n = 100 has mean = 30. Assuming the population standard deviation is 8, construct 95% confidence interval for population mean.
Do you think that all random samples taken from the same population will lead to the same result?
A population has a mean of 53 and a standard deviation of 21. A sample of 49 observations will be taken what is the probability that the sample mean will be greater than 57.95?
What sample size and acceptable level would result in a probability of .05 that a good batch will be rejected and a probability of .10 that a bad batch will be accepted?
What is the difference in appearance between a t-distribution and a z-distribution? Why do they have slightly different appearances?
Promotion occurs on average every 10 days in a large corporation. What is the probability that the next promotion will occur within:
In a recent year Barry Bonds hit 73 home runs in the 153 games he played. Assume that his home run production stayed at that level the following season.
The types kinds of statistical information collected in your professional setting. Provide examples to illustrate the information/data.
A developmental psychologist is studying memory development in children. He is interested in determining the exact age at which children began to recall long-term episodic memories.
Do the data demonstrate that the true mean photometer reading for the color density is significantly different from 12 at 3 percent level of significance?
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