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The standard error of the mean for a sample of size 167 is 25. In order to cut the standard error of the mean in half (to 12.5) we must select a sample size of 83.5 selected answer (wrong)
Please help me understand how I got the wrong answer.
"Busting the Nursery Rhymes" reports that "Research from a team at Bristol Royal Hospital for Children [in England] found that there's more violence
The probability that a business owner will go bankrupt in it first year is .34. For 25 like businesses, find the probability first by using the binomial probability formula, and then by using the normal approximation.
A marketing research company was interested in importing apples. There were three different varieties, and the number purchased was found to be:
Second inning 2006. Perhaps fans are just more interested in teams that win. The displays below are based on American League teams for the 2006 season.
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%.
Calculate the partial correlation between gender and punctuality while removing the influence of watch-wearing.
Find the sample proportion of individuals surveyed who ate fast food for dinner at least once in the past week.
in the formula for a variance what is the sum if we dont square the x-u values? hint there is a special name for this
(a) State formally the hypotheses necessary to conduct a non directional test of no difference between the two population means.
A pizza restaurant manager claims that the average home delivery time for their pizza is no more than 20 minutes.
Conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
(a) Model the policy bring the umbrella only when it rains" as a Markov chain by defining the state space and transition probabilities. (b) What percentage of the time is the employee going to be wet?
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