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The Bureau of Labor Statistics reported that the mean amount spent per year by all American citizens on tobacco products and smoking supplies was $308. The Bureau wants to estimate the mean amount spent on tobacco products by American Latinos. assume the standard deviation is known to be $117. How many people should the Bureau sample in order to estimate the mean amount spent by American Latinos to within $12, if they want to be 90% confident in thier interval?
They both want to know what family member typically does the research about possible honeymoon destinations, and who primarily makes the decision on selecting the destination.
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
A normal distribution was used as the prior for the mean, and it was found that posterior mean was 15 and the posterior standard deviation was 0.1 what were the mean and standard deviation of the prior.
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.81
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.
a subsample from the current population survey is taken on weekly earnings of individuals their age and their gender.
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
Examined the effect of body position on blood pressure
If member of sales force submits the entertainment expense (dinner cost for four) of $190, must this expense be considered unusually high. Calculate and interpret z- score for each of six entertainment expenses.
a) Find the marginal density of Y. b) Find E(X) HINT: What is E (X|Y=y) ?
How large should n be so that a 90% confidence interval for µ has a margin of error and What is the P-value for a test of the hypotheses
A recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. To test the claim, a researcher selected a random sample of 36 gum chewers and found the mean number of sticks of gum chewed per d..
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