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On a multiple choice test of 13 questions, each question has four (4) possible answers, one of which is correct. For students who guess at all answers, find the following, if X is the number of correct guesses. (i). The mean of the random variable X. (ii). The standard deviation of the random variable X. (b).In a city the probability that a person will pass his or her driving test the first attempt is 0.66.Four people are selected at random from among those taking their driving test for the first time. Determine the following. (i). The probability that exactly one person passed the test. (ii). The probability that exactly two persons passed the test. (iii) The probability that at least two persons passed the test. (iv).The probability that at least three persons passed the test.
a banks loan officer rates applicants for credit. the ratings are normally distributed with a mean of 200 and a
What information is provided by the sign (= or -) of the Pearson correlation? What information is provided by numerical value of the Pearson correlation?
a sample of four tires is taken from alot of brand-a tires. another sample of four tires is taken from a lot of brand-b
1. one single number digit is selected randomly a. list the sample space. b. what is the probability of each event?
Calculate the covariance
Which of the following is the correct interpretation for the regression coefficient of Age? The regression coefficient is not significantly different from zero.
given the following data on seven seas sales type of boat observed sales expected sales expected observedpirates
The mean is 15.8 tons. the sample standard deviation is 5.0 tons. what is the 95 percent interval for the population mean?
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
A decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 67%.
Assuming the requirements of ANOVA are satisfied, at the .05 level of significance, is there evidence of a significant difference among the mean wait times at the five checkpoints?
Use the steps of hypothesis testing. (b) Sketch the distributions involved. (c) Explain your answer to someone who has never taken a course in statistics.
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