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A simple random sample of 50 adults is obtained, and each person's red blood cell count (in cells per micro-liter) is measured. The sample mean is 5.23. The population standard deviation for red blood cell counts is 0.54. Use a 0.01 significance level to test the claim that the sample is from a population with a mean less than 5.4, which is a value often used for the upper limit of the range of normal values. What do the results suggest.
Using Binomial approximation, find the proportion of the days that will be rejected.
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
what is the sample space of all possible outcomes? Are the outcomes equally likely?
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect?
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
State the appropriate set of hypothesis to test whether there is a relationship between the variables X and Y.
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
The average age of the women was 45.582 with a standard deviation of 5.143. He uses this information to calculate a 95% confidence interval for the differnce in means, (-11.41, -5.422). The best interpretation of this interval is which of the foll..
Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.
Find the 99% confidence interval for the population proportion.
Describe the difference between sample and a sampling distribution. Your reply must be in complete sentences and you may use sketches to help you.
What IQ score should one have in order to be eligible for Mensa?
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