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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
The cholesterol levels of americans are approximately normally distributed with a mean of 196.5 mg/dl and standard deviation of 34.5 mg/dl.
In Watsonvill CA, a major producer of strawberries, reccords were kept on the relationship between the rainfall ( in inches) and the yield of strawberries (pounds per acre).
In order to determine if installing an air quality system would be cost effective, an unairconditioned factory kept records on the reported high temperature readings and employee absenteeism.
A population of N=12scores has a mean of µ= 8.After one score is removed from the population, and the new mean is found to be 9. What is the value of the score that was removed?
A population of n=16 scores has a mean of µ= 20.After one score is removed from the population, the new mean is found to be µ=19. What is the value of the score that was removed?