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Q1) A sample of 23 European countries found that variance of life expectancy was 7.3 years. Determine the 95% confidence interval estimate for variance of life expectancy in Europe?
a) 27.2 < σσ2 < 118.3
b) 5.6 < σ2 < 10.3
c) 4.4 < σ2 < 14.6
d) 28.9 < σ2 < 115.0
Q2) Determine the 95% confidence interval for standard deviation of lengths of pipes if sample of 26 pipes has standard deviation of 10 inches.
a) 14.0 < σ < 16.0
b) 7.8 < σ < 13.8
c) 74.0 < σ < 126.0
d) 60.8 < σ < 190.5
Q3) Average gas mileage of certain model car is 26 miles per gallon. If gas mileages are normally distributed with standard deviation of 1.3, determine the probability that randomly selected car of this model has gas mileage between 25.8 and 26.3 miles per gallon.
a) 0.15
b) 0.85
c) 0.70
d) 0.30
Q4) At large department store, average number of years of employment for cashier is 5.7 with standard deviation of 1.8 years. If number of years of employment at this department store is normally distributed, determine the probability that cashier chosen at random has worked at the store for over 10 years?
a) 0.4916
b) 0.9916
c) 0.0084
d) 0.0054
Q5) To be accepted into top university, applicants should score within top 5% on the SAT exam. Given that SAT test scores are normally distributed with mean of 1000 and standard deviation of 200, compute the lowest possible score a student needs to qualify for acceptance into the university?
a) 1330
b) 1400
c) 1250
d) 1100
Find out the correlation among the two variables in the regression. A simple linear regression produced the following computer output.
Suppose that this is a simple random sample of adult residents of Maine.
the maximum point total for the quarter was 200. The point totals for the 10 students are given in the stemplot below. For the density curve displayed below, which of the following is true?
What is your conclusion? Are the two variables independent?
Is it necessary to assume a normal distribution on the population to estimate the value of the mean spending per day? Explain.
Determine the probability of randomly selecting a person graduating with Master's degree who didn't major in Education.
Which of these variables are discrete and which are continuous random variables?
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
Evaluate z statistic for the Wilcoxon rank sum test, standard deviation for the Wilcoxon rank sum test and P-value for the Wilcoxon rank sum test
Calculate the coefficient of skewness and coefficient of variation of minutes spent commuting. What do these statistics tell us?
We are interested in determining whether or not the opinions of the individuals (as to Yes, No, and No Opinion) are uniformly distributed.
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
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