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1) If there are 150 values in a data set, how many classes should be created for a frequency histogram?
A. 5
B. 6
C. 7
D. 8
E. 9
2) . If x is a binomial random variable where n = 100 and p = 0.2, find the probability that x is less than or equal to 15 using the normal approximation to the binomial.
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
if Susan constructs a small station and the market is good, she will realize a profit of $50,000.What is the maximax decision? What is the Hurwicz (criterion of realism) decision with α = 0.8?
Give a simplified expression, not involving a sum of a large number of terms, for the probability that the received message has errors which go undetected.
A typical problem statement is correlation research is _____________
Let Z be a standard normal random variable. Determine the value of c
The theoretical sampling strategy is a sampling method in which we sample with replacement and the order in which a participant is selected matters.
Does the width of the confidence intervals constructed in parts a through c increase as the sample size decreases? If yes, explain why.
You randomly select 425 students and ask each one what the top motivation is for using a credit card. Can you conclude that there has been a chagne in the claimed or expected distribution? Use a =0.025.
Suggest a subset selection method and a shrinkage method that could be used here.
Compute a 95% confidence interval for the difference in mean ages of death for the strong right- and left-handers. Interpret the result.
In the first two months of a recent year, 95 occupants were killed by air bags, and 63 of them were "improperly belted".
Find the values of b0 and b1 using the method used in regression, and predict the time in minutes required by the operator to produce the component, after 3 hours of training.
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