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If the goal is to test whether the average salary for managers is greater than $54,000, what is the value of the critical test statistic at the 10% level of significance?
Nationwide, the average waiting time until a electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found
The 31-40 age bracket (28 of whom smoke). If one person is randomly selected from this sample, find the probability of getting someone who is age 18-22 or does not smoke.
According to a survey 41 % of major US companies electronically monitor their employees. Suppose that 5 such companies are selected independently and at random. What is the probability that 2 compan
If many samples of size 100 (that is, each sample consists of 100 items) were taken from a large non-normal population with a mean of 10 and variance of 16, what would be the mean, variance, standar
The pattern is, count heads, toss heads, count tails, toss tails, count heads, toss heads, etc., and X0 = 3. Then (Xn) is a Markov chain. What is its transition matrix?
If many samples of 36 employees each are taken and sample means computed, a distribution of sample means would result. What would be the mean, standard deviation and shape of the distribution of sam
Calculate the test statistic and perform the test at 5 percent significance level. What is your conclusion? Suppose the null hypothesis you constructed in part A is true. What is the probability of a
The amount of time a bank teller spends with each customer has a population mean x = 3.1 minutes and population standard deviation x = 0.4 minute.
Assume that the bulb was installed at noon today and assume that at 5:00 pm today you notice that the bulb is still working.
Should all of the independent variables be used in the analysis or can some be dropped? Did you notice any indications to multicollinearity, heteroscedasticity or to autocorrelation?
Mr. Sleig would like to know if there is a difference in the mean checking account balances among the four branches. If there are differences, between which branches do these differences occur?
Refer to the following information and output. What is the probability that the service facility will be idle?
Is there sufficient evidence to conclude that the mean number of transactions per customer is more than 10 per month? Could the advertising agency say the mean is more than 9 per month?
Test the null hypothesis that population variance is $100 dollars against an alternative that it is greater than $100. Assume = 0.05.
For many years the mean checking balance has been $1,600. Does the sample data indicate that the mean account balance has declined from this value?
Develop a 95% confidence interval for the proportion of customers using these cards. On the basis of the confidence interval, is it reasonable to conclude that more than half of the customers use a
the given categories is 18% for the under 26 group, 39% for the group, 31% for the 45-65 group, and 12% for the group over 65. Find the critical value to test the claim that all ages have purchase r
Assume a random sample of 40 gasoline stations is slected and their mean cost for regular gasoline is computed. What is the likelihood the sample mean is greater than $3.08?
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
In recent years, about two-thirds of US house holds purchased ground coffee. Find the probability that a household spent more than $60.00.
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 stan
The amount of Jen's monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile.
The Rutter Nursery Company packages their pine bark mulch in 50-pound bags. Can Mr. Rutter conclude that the mean weight of the bags is less than 50 pounds? Use the .01 significance level.
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greate