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In a recent year, about two-thirds of US households purchased ground coffee. Consider the annual ground coffee expenditures for households purchasing ground coffee, assuming that these expenditures are approximately distributed as a normal random variable with a mean of $65.16 and a standard deviation of $10.00.
a. Find the probability that a household spent less than $35.00.
b. Find the probability that a household spent more than $60.00.
c. What proportion of the households spent between $40.00 and $50.00.
d. 99% of the households spent less than what amount?
Classify as independent or dependent samples: The average price of gasoline at ten local stations, and the average price of gasoline at ten stations in another state.
A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean.
A family has 5 children and 1 of them is a boy...the percentage of boy is 1/5, or .020. Do you think one could say the chances of any woman having a boy would be 1/5? Explain your answer.
The mean and median selling price of existing single-family homes sold in October 2005 were $216,200 and $265,000. Which of the following most accurately explains which is the mean and which is the median and why?
Research reports an F=ratio with df=3.36 from independent-measures research study. How many treatment conditions were reported in the study what was the total number of participants?
What is the probability that at least one of the 40 shuttle missions scheduled over the next 5 years results in a critical-item failure?
Here are the DMS odor thresholds for 10 untrained students:
An investor owns three common stocks. Each stock, independent of the other, has equally likely chances of: List the possible outcomes of this experiment. Estimate the probability at least two of the stocks increase in value.
The math SAT scores for all women are normally distributed with a mean of 496 and a standard deviation of 105.
A confidence interval estimate for the population mean is given to be (41.16, 49.85). If the standard deviation is 16.290 and the sample size is 54, answer each of the following (show all work):
Set up hypotheses and carry out all relevant tests. Describe all results and implications which you have discovered.
A leasing firm claims that the mean number of miles driven annually, m, in its leased cars is less than 13280 miles. A random sample of 150 cars leased from this firm had a mean of 12584 annual miles driven.
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