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After listing the possible samples and finding the proportion of males in each sample, use a table to describe the sampling distribution of the proportion of males.
Three randomly selected households are surveyed. The numbers of people in the households are 1, 3, 8. Assume that samples of size n = 2 are randomly selected with replacement from the population of
Is this an appropriate sampling scheme if the assignable cause in the process results in an instantaneous upward shift in the mean that is of very short duration? If your answer is no, propose an al
For the following conditions, determine if it is appropriate to use the normal distribution to approximate a binomial distribution with n=38 and p=0.3. Explain your answer.
Consider the discrete probability distribution to the right when answering the following question. Find the probability that x exceeds 4. x| 3, 4,7, 9 P(x) | 0.26, ? , 0.22, 0.02
Two airplanes are flying in the same direction in adjacent parallel corridors. At time
The inside diameter of a randomly selected piston ring is a random variable with mean value 10 cm and standard deviation 0.08 cm. Suppose the distribution of the diameter is normal. (Round your answ
Assume that the significance level is a = 0.1. Use the given information to find the P-value and the critical values. The test statistic of z = 1.84 is obtained when testing the claim of p>0.1.
Suppose your statistics instructor gave six examinations during the semester. You received the following grades (percent correct): 80, 74, 90, 93, 94, and 73. Instead of averaging the six scores, t
What are the consequences on the estimators b1 and b2 if the assumtion on the expected residuals is not true?
Describe how one could select two dependent samples from among his/her co-workers in General Motors to compare their starting salaries after graduation from high school to their salaries when they c
The data show the time intervals after an eruption (to the next eruption) of a certain geyser. Find the regression equation , letting the first variable be the independent (x) variable.
If two independent samples are used in a hypothesis test concerning the difference between population means for which the combined degrees of freedom is 25, which of the following is true about the
Suppose your statistics instructor gave six examinations during the semester. You received the following grades (percent correct): 93, 67, 88, 90, 89, and 72.
Two different testing agencies develop their own achievement tests for the same subject. Both tests are given to the same random sample of 10 students. The results are given in the table below.
The correlation between interview score and job performance was found to be +0.45. Interview Job Performance mean = 4.50 mean = 70.50 std. dev. = .75 std. dev. = 9.00 a. Find the regression equation
Consider monitoring the number of critical cracks in the I-77 Interstate Highway starting at Columbia, SC (Mile Marker 0). Assume that the number of critical cracks could be modeled according to a h
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries.
The length of human pregnancies from conception to birth varies according to a normal distribution with mean 268 days and a standard deviation 19 days.
Suppose for a large population of women the mean height of all women is 164.3cm with a standard deviation of 6.5cm. If 90 of the women are to be selected at random find the probablility their mean hei
An urn contains 10 chips, of which 5 are blue and 5 are red. Randomly select 5 chips, one at a time without replacement. Let X be absolute difference between the numbers of blue and red chips that h
High temperatures in a certain Montana city for the month of July follow a uniform distribution over the interval of 80F to 109F. Find the high temperature which 90% of the July days exceed.
Consider the discrete probability distribution to the right when answering the following question. Fine the probability that x exceeds 4. x - 3, 4, 7,9 p(x) - 0.26, ?, 0.22, 0.02 A) find the probabi
Choose an option that describes the cause-and-effect relationship STATISTICS