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A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HD cholesterol within 4 points with 99% confidence assuming the Q = 17.9? Suppose the Doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required?
A 99% confidence level requires subjects.
Because a 95% confidence interval is required .04 points. Use a standard normal table to find the critical value.
What sample size should be chosen so that there is 0.95 probability of estimating the mean monthly income in $150 or less?
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
The board of directors of Saner Automatic Door Company consists of 12 members, 3 of whom are women.
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.
Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
Given that consumer changed te brands, what is the probability that consumer purchased fewer products than before?
Find the critical value for t and determine the null and alternate hypothesis.
Find the sample space for the number of outcomes (you don't need to list the possible outcomes, just how many possible outcomes there are).
What is the 90% confidence interval estimate of the difference between two population means.
Suppose that an IQ test was given to a large group of persons, the scores are assumed to be from a normally distributed population, that mean = 100 and s (standard deviation) = 15.
In a random sample of 35 trading days, the volume of a particular stock is recorded to determine whether the mean volume of the stock changed from its 2007 value of 35.14 million shares.
a. Determine the sample proportion, p, of households with cellular telephones that can be used to access the Internet. b. If the population proportion is 0.40, determine the standard error of the proportion.
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