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A researcher is interested in determining the partial correlation between age (X) and attitude towards interracial marriage (X), controlling for place of residence (rural or urban) (W). The researcher finds the following correlations: r sub xy=0.60; r sub xw=0.43; r sub yw=-.70, for N=175. Calculate the partial correlation coefficient and the t ratio. Set a=.05. What should the researcher conclude?
Findout the margin of error for this survey if we want a 99 percent confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
You're interested in determining the volume of sales dollars necessary for the coming year to reach the break-even point. You've decided to break down the sales for the club into four categories, they are as follows:
An experimenter is randomly sampling 5 objects in order from among 49 objects. What is the total number of samples in the sample space?
A recent article in the Arizone Republic indicated that the mean sellingprice of the homes in the area is more than $220,000. Can we conclude that the mean selling price in the Goodyear, AZ area is more than $220,000.
The probability that more than 6 planes arrive in the next minute is _____.
What is the probability of randomly selecting a student with a treadmill time greater than 25 minutes? In symbols, p(X>25)= ? What is the probability of randomly selecting a student with a time greater than 30 minutes? In symbols, p(x>30) ?
Can researcher conclude that humidity has significant effect on eating behaviour? Use two-tailed test with a = 0.05.
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
Assume you were in charge of advertising for an automotive dealership when the gas prices increased to $6 per gallon. Most of your cars are fuel-efficient, but you have two models that have extremely poor fuel economy
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
Mattel Corporation produces a remote-controlled car that requires three AA batteries. The mean life of these batteries in this product is 35 hours with a standard deviation of 5.5 hours. As part of its testing program Sony tests samples of 16 batt..
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