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Carbon monoxide (CO) emissions for a certain kind of car vary mean 2.4 g/mi and standard deviation 0.7g/mi. A company has 60 of these cars in its fleet. Let y represent the mean CO level for the companies fleet. Estimate the probability that y is between 2.5 and 2.6/mi.
p(2.5<γ,<2.6)=
a. what is the point estimate of the population mean? b. what is the point estimate of the population standard deviation?
Use three decimal places in your answers for this problem. The following table was collected.
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 195 was taken, and the mean amount spent was $210.97.
Suppose that January sales for the fourth year turn out to be $295,000. What was your forecast error? If this is a large error, Karen might be puzzled about the difference between your forecast and actual sales value.
Pharmacies continually monitor their prescription filling process. A local pharmacy has noted that the time to fill a prescription for a generic antibiotic is normally distributed, with a mean of 13.3 minutes and a standard deviation of 2.8 minute..
Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
Components shipped include 0.5% defectives. You plan to select 80 items; if 0 are defective, you will assume all are okay.
A man is in the process of buying a new car. He has a choice of 3 engine makes, 7 body styles and 10 colors. How many different cars does he have to choose from?
What measurements assesses the amount of variance of change in the dependent variable reflected by changes in the independent variable?
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
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