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Create a 95% confidence interval for the value of the population mean, given that their are 64 observations and a sample mean of 49, with a sample standard deviation of 3,test the hypothesis with an alpha equal to .05. does the agree with your hypothesis test?why or why not?
Boston Globe article "bargains on the menu-and a Side of Jitters" reported concerns
Construct a point estimate of the proportion of items returned for the population of sales transactions at the Houston store and construct a 95% confidence interval for the porportion of returns at the Houston store.
The mean age of adult learners in a chosen class of 31 students is 33.8 years. The standard deviation is equal to 7 years.
Lauren Moore has sold her business for $500,000 and wants to invest in condominium units ( which she intends to rent) and land ( which she will lease to a farmer).
Is this sample sufficient to conclude that the eye spots have a significant influence on the birds behavior? Use a two tail test with alpha =.05. Compute the estimated Cohen's d to measure the size of the treatment.
The price of each selected item was checked at each of the three chains on the sames day. Use 0.05 level of significance. What is the decision rule for both.
Conduct a hypothesis test to see whether the returns for mid-cap growth funds over the same period are significantly different from the average for U.S. Diversified Equity funds.
This result applies no matter what the shape of the probability distribution from which the samples are taken. Central Limit Theorem: How Large a Sample?
Regression equation Credits=15.4-.07. Select the correct statement. Increase in number of hours worked per week increases the expected number of credits.
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
Assume x is normally distributed with mean u=15 and standard deviation 0=3. Use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions.
Given route measured in terms of passengers carried (range is 0.1 to 1). Regress lfare on dist, passen and concen, and provide the heteroskedasticity-robust standard errors.
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