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During recent seasons, Major League Baseball has been criticized for length of the games. A report indicated that average game lasts 3 hours and 30 minutes. A sample of 17 games revealed following t
Martin Motors has in stock three cars of same make and model. The president would like to compare the gas consumption of three cars (labeled car A, car B, and car C) using four different kinds of g
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the reve
Conduct tests of hypotheses to find out which of independent variables have significant regression coefficients. Which variables would you consider eliminating? Employ the .05 significance level.
Banner Mattress and Furniture Company desires to study the number of credit applications received each day for the last 300 days. The information is reported on next page.
You work for business analytics department of large commercial bank, and you learn that the balances of the small-business accounts are distributed on log-scale according to normal distribution. Wha
Suppose the heights of kindergarten children can be stated by Normal distribution with a mean of 37.2 inches and standard deviation of 2.1 inches.
Look at the relationship between husband's education and his wife's education separately for couples in which wife is employed full time and in which wife is not employed full time.
Choose full-time workers only. Obtain the plot of hours worked last week with email employ and education.
Explain the relationships you see. Show your plots. Based on these plots, which variable do you think is best predictor of internet usage?
A random variable is normally distributed with the mean of 50 and standard deviation of 5. Find out the probability the random variable will suppose a value between 45 and 55?
For borrowers with the good credit score, the mean debt for revolving and installment accounts is $15,015 (Business Week, March 20, 2006). Suppose the standard deviation is $3540 and that debt amo
A person must score in upper 2% of the population on IQ test to qualify for membership in Mensa, the international high-IQ society.
Find out the probability of completing the exam in one hour or less? Find out the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes?
According to the Sleep Foundation, average night's sleep is 6.8 hours. Suppose the standard deviation is 0.6 hours and that the probability distribution is normal.
In a typical week, how many times do you eat at a fast food restaurant? The following data was then gathered: Find out the probability that the student eats at a fast food restaurant 5 or more t
For a sample with mean = 50 and standard deviation = 10. Find out the z-score for each of the following X values:
For sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, find out the sample mean?
Find out each of the following probabilities (P) for the normal distribution.
For the normal distribution, find out the z-score value(s) that separate the area of distribution into sections so that there is.
The distribution of scores on SAT is approximately normal with mean of 500 and standard deviation of σ = 100. Find out the percentage have SAT scores greater than 550?
Find out the z-score corresponding to each of following sample means obtained from this population.
A random sample is obtained from the normal population with mean of µ = 80 and standard deviation of σ = 8. A sample mean greater than 86 for a sample of n = 4 scores.
The distribution of SAT scores is normal with mean of µ = 500 and standard deviation of σ = 100. What range of values must contain sample mean 95% of the time?
Now assume the distribution of SAT scores is normal with mean of µ = 500 and standard deviation σ is unknown. What range of values must contain sample mean 95% of the time?