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Determine the sample size needed to construct a 90% confidence interval to estimate the population proportion when p = 0.65 and the margin of error equals 6%.
a field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain
Calculate separately for 1983 and 1987, the 95% confidence interval for the proportion of students who had driven an automobile while drinking.
For each mutual fund, find an interval in which you would expect 95.44 percent of all yearly returns to fall. Assume returns are normally distributed.
there are six identical elements in active parallel configuration with a time to failure density function of
a set of sample scores from an experiment has an n 30 and an xobt 19.a. can we reject the null hypothesis that the
if the random variable z is the standard normal score and a gt 0 is it true that pz lt -a pz gt a? why or why not?
How to drive the car is 9.5 hours with a standard deviation of 1.5 hours. Test the managerâ??s claim at the 1% significance level. Determine the critical values of the test statistic.
Find the probability between the given values for normal distribution.
If you know you need a sample size of 1,063 out of 300,000 to get a 95% confidence level and a 3% confidence interval what steps would you take to get a random sample?
When using dummy variables in a regression equation to model a qualitative or categorical variable, the number of dummy variables should equal to
Take pM and pF to be the proportions of all college males and females who worked last summer. We conjectured before seeing the data that men are more likely to work. The hypotheses to be tested are?
Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
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