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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
Suppose we want to determine the (binomial) probability(p) of getting 3 heads in 13 flips of a 2-sided coin. Using the Binomial Probabilities Table in Appendix B of the text, what values of n, x and
Also assume that the amount of money spent by each customer is independent of the number of customers to enter the store. Calculate the expected amount of money spent by the customers that enter the
Show that the sum of two independent Poisson random variables has a Poisson distribution. Let X and Y denote two Poisson random variables with parameter Lx and Ly , respectively. Assume that the ran
Find the normal approximation for the binomial probability that x = 4, where n = 12 and p = 0.5. Compare this probability to the value of P(x=4) found in Table 2 of Appendix B in your textbook. Show
The correlation between rate and math SAT score is r = -0.85. If instead of plotting these variables for each of the 50 states and the District of Columbia, we plotted the values of these variables
The magnitude of the variance due to individual differences must be measured and subtracted out of the variance between treatments in the numerator of the F-ratio for a repeated-measures ANOVA.