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For the variable "length of hospital stay," determine the sample distribution of the sample mean for samples of 80 patients on the intervention ward.
Show the estimated regression equation. Compute the coefficient of determination and comment on the strength of the regression relationship.
Suppose x is a positive random variable with E[X]=5.3 and standard deviation of x is 1.6 . find:
You arrive to a trolly stop, just missing the last trolly. The time until the next rolly arrival is modeled as a U(4,6) random variable. You decide that you will walk to your destination (and not us
If a group of 40 males had a mean of 7 and a standard deviation of 2.5, while a group of 35 females had a mean of 5 and a standard deviation of 1.4, the standard error of the difference between the
If you studied 40 men in Group 1 and they have a mean of 7 and a standard deviation of 2.5, while the 35 men in Group 2 have a mean of 5 and a standard deviation of 1.4, what is the approximate valu
Your data show that the 80 eastern wholesalers had 40 percent of their sales to department stores, while the 60 western region wholesalers had 25 percent of their sales to department stores. The poo
Your data show that the 80 males had 40% of their sales to these chains, while the 60 females had 25% of their sales to these chains. For these data, the standard error of the difference in proporti
If the standard error of the difference between proportions is 0.08, the Z-test value for these data is approximately.
Bob buys a new machine that produces widgets. With this machine, only 2% of widgets produced are are defective. We randomly select two widgets that have been produced by the machine. For the followi
(a) What is the point estimate of the population mean? (Round your answer to 3 decimal places.) Population mean $ (b) Determine the 98% confidence interval for the population mean. (Round your answe
If 70 percent of a target market sample of 80 people are aware of a brand name, the standard error of proportion for this study is approximately
In a brand awareness study of 80 consumers, 52 of them were able to identify "Corolla" as a type of Toyota automobile. The chi-square value for a test of this brand awareness was approximately.
If you wanted to find the 95 percent confidence interval (two-tailed test), and if the Z-value at the.05 level of significance is 1.96, the confidence interval lies between approximately
If the population mean is expected to be 85 and the sample mean is 80, the sample standard deviation is 2, and the sample consists of 100 consumers, the observed value of the Z-statistic is approxim
If the population mean is assumed to be 20 and the sample standard deviation is 5, a score of 15 would have a Z-value of approximately
If a researcher wants to be 95 percent confident about the results of a study and past studies of the same attitude measure have indicated that about 20 percent of the target market was in favor of
If a researcher wants to conduct a study about how much consumers in a target market segment will spend this year on detergent, and if this study was conducted last year with a standard deviation of
Percent confident of the results with an error of plus or minus $1.50, and if this same type of study conducted last year had a standard deviation of about $29.25, the appropriate sample size for th
If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120, the 95 percent confidence interval about the mean is between approximately
At alpha levels of .05 and 0.10, test whether there has been a significant decrease in the mean time per mile? The results are given below.
Assume that Westside estimates the demand to be 6,000 loaves per month. What profit or loss is anticipated with this level of demand for the year? (Use 12 months to calculate the year's demand and d
Suppose a life insurance company insures the lives of 1,000 men aged 30. If actuarial studies show that the probability that any 30-year old man will die in a given year to be 0.003, find the probab
A missile has a probability of 0.05 of penetrating enemy defenses and reaching its target. If ten missiles are aimed at the same target, what is the probability that exactly three will hit its targe
The State of OH averages four tax evaders per 100 tax filers. If 50 tax filers are randomly selected from the state, what is the probability of the following: