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Researchers asked a sample of 50 1st grade teachers and a sample of 50 12th grade teachers how much of their own money they spent on school supplies in the previous school year. They wanted to see if teachers at one grade level spend more than teachers at the other grade level.
a. What type of study is found-observational or randomized experiment? Explain.What is the experimental unit?c. What is the response variable?d. What is the explanatory variable?e. Do we have to worry about confounding variables in this instance? Why? If so identify a possible confounding variable?f. Are either of the terms retrospective study or prospective study relevant? Explain.
A local politician wants an estimate of the proportion of the population who support her fiscal policies. She wants the estimate to be within .06 of the true proportion. Assume a 95 percent level of confidence.
Scenario: Dole Pineapple, Inc., is concerned that the 16-ounce can of sliced pineapple is being overfilled. Assume the standard deviation of the process is .03 ounces.
Multiple regression analysis produced following regression equation: Y' = 427.2 - 4.58X1 - 14.83X2 + 6.10X3. Which statement is right based on this analysis?
Choose one of the options below that explains what information is provided in the interval that is not in the significance test results:
Create a 95% confidence interval for population proportion of positive drug tests.
Nicotine patches are often used to help smokers quit. Does giving medicine to fight depression also help? A randomized double blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive both a patch and the antidep..
By using the fact that Martha believes the treatment will decrease the amount of time to fall asleep, describe the null and alternate hypotheses.
A car manufacturer has redesigned the anti-theft device on one of its models to increase the time that it takes for a professional car thief to be able to steal the car.
Suppose that you perform a significance test regarding a population mean, and that the evidence does not warrant rejection of the null hypothesis.
Suppose a random sample of 50 architects and engineers is selected. How likely is it that the random sample contain five or fewer women in these positions.
Give a variable that could be used to stratify the population for each of the following studies. List at least four subcategories for each variable.
Identify which of the methods from this lesson (GCF, grouping, difference of squares, or perfect squares) could be used to factor the polynomial.
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