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An Electric Co. Operates a fleet of trucks that provide electrical service to the construction industry. Monthly mean maintenance cost has been $75 per truck. A random sample of 40 trucks provided a sample mean of $82.50 per month, with a sample deviation of $30. Managers want a test to determine whether the mean monthly maintence cost has increased.
A. Using a .05 level of significance, what is the rejection rule for this test?
B. What is your conclusion based on the sample mean of $82.50?
C. What is the p-value associated with the sample result? What is your conclusion based on the p-value?
A study was conducted with 35 people that resulted in a mean of 22.1 minutes with a standard deviation of 1.9 minutes. Using a .05 significance level, test the claim that the mean amount of time relief will be felt is less than 25 minutes.
Which of the following statements is true regarding a nonparametric test?
What is the advantage of a randomized experiment in which the investigators randomly assign treatment conditions to subject over an observational study in which the subject self-select the treatment groups?
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
You are the manager of a fast food restaurant. You want to determine whether the population mean waiting time to place an order has changed in the past month from its previous population mean value of 4.5 minutes.
From past estimates, manager thinks that about 4% of customers have expressed dissatisfaction. What sample size must you use for this survey?
Identify 5 variables of interest to healthcare managers. Select and define one variable and include your rationale for selecting this variable. What is the difference between a dependent and independent variable?
What is the appropriate procedure to test a significant difference in means between the two groups? Use the critical -value method.
If 20 voters are selected at random, and X is the number of voters which support this referendum, determine the mean and variance of X.
The owner of a local night club has recently surveyed a random sample of n=250 customers of the club. She would now like to determine whether or not the mean age of her customers is over 30.
A) Describe the term population. B) Describe the term random sample. C) What is the difference between a population and a random sample?
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