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A study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race
A researcher wishes to compare the effects of two fertilizers on the yield of a soybean crop. She has 20 plots of land available and she decides to use a paired experiment - using 10 pairs of plots.
An experiment to measure the effect of giving growth hormones to girls affected by Turner's Syndrome was carried out recently in Vancouver.
We wish to investigate if a new medicine is effective in reducing the length and severity of the flu. We take the next 20 patients who come to the walk-in clinic complaining of a flu and , after a m
A nutritionist wants to study the effect of storage time (6,12, and 18 months) on the amount of vitamin C present in freeze dried fruit when stored for these lengths of time.
There is a linear relationship between the number of chirps made by the striped ground cricket and the air temperature. A least-squares fit on some data collected by a biologist gives the model
A study found correlation r=.061 between the sex of a worker and his or her income. You conclude that
The average yearly snowfall in Chillyville is Normally distributed with a mean of 55 inches. If the snowfall in Chillyville exceeds 60 inches in 15% of the years, what is the standard deviation?
If the median of a set of data is equal to the mean, then
The proportion of observations from a standard Normal distribution that take values greater than 1.15 is about
A sample of 99 distances has a mean of 24 feet and a median of 24.5 feet. Unfortunately, it has just been discovered that an observation which was erroneously recorded as "30" actually had a value o
The mean salary of all female workers is $35,000. The mean salary of all male workers is $41,000. What must be ture about the mean salary of all workers?
The five-number summary for scores on a statistics exam is 11, 35, 61, 70, 79. In all, 380 students took the test. About how many had scores between 35 and 61?
Which of the following random variables is geometric? The number of phone calls revived in a one-hour period
Suppose X has a geometric distribution with probability 0.3 of success and 0.7 of failure on each observation. The probability that X=4 is
An event A will occur with probability 0.5. An event B will occur with probability 0.6. The probability that both A and B will occur is 0.1.
If you buy one ticket in the Provincial Lottery, then the probability that you will win a prize is 0.11. If you buy one ticket each month for five months, what is the probability that you will win a
Which of the following relationships is most likely to result in a strong negative correlation?
A fair coin is tossed four times, and each time the coin lands heads up. If the coin is then tossed 1996 more times, how many heads are most likely to appear for these 1996 additional tosses?
Suppose that a random sample of 5 suspects is subjected to a lie detector test regarding a recent one-person crime. Then the probability of observing no positive reading if all suspects plead innoce
The linear correlation coefficient is a numerical value that ranges from -1.00 to +1.00. Describe in a sentence or two the meaning of each of these correlation coefficients.
Two dice are thrown and the sum of the numbers which come up on the dice is noted. Let us consider the following events associated with this experiment
A sample of 20 items from a population with an unknown s is selected in order to develop an interval estimate of m. Which of the following is not necessary?
Four cards are selected, one at a time from a standard deck of 52 cards. Let x represent the number of aces drawn in a set of 4 cards. If this experiment is completed without replacement, explain wh