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The Intelligence Quotient (IQ) test scores for adults are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability we could select a sample of 50 adults and find the mean of this sample is less than 95?
question a recent study by an automobile dealer revealed the mean amount of profit per car sold for a sample 20
FedEx and United Parcel Service (UPS) are the world's leading cargo carriers by volume and revenue (The Wall Street Journal, January 27, 2004).
What is the probability that he can open the lock at random if he knows that the numbers in the combination cannot be repeated?
find the P-value associated with each of the given below values of the test statistic. (Give the answers to four decimal places.) (a) z = 1.20
Also include information about the number of participants you would assess and how you would go about estimating effect size and statistical power (when relevant).
If the goal is to test whether less than 75% of the flights depart on time, what is the value of the critical test statistic at the 10% level of significance?
Based on a P-value of 0.0248 the researchers concluded there was evidence that low birth weights may be a risk factor for susceptibility to depression. Explain in context what the reported P-value means.
At the 0.05 significance level, can we conclude that equal numbers of Canadian retirees living in Hawaii came from each of the four cities?
A standard deviation of 8 minutes before they could see doctor. Give the 99% confidence interval for average waiting time for all of patients who visit doctor.
the national safety council released the following data on the incidence rates for fatal or lost-work time injuries
for the most recent year available the mean annual cost to attend a private university in the united states was 20082.
Suppose that population variances from both conditions are equal is there evidence that treatment decreases surface hardness of steel plates?
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