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Question: Validity of a scale to measure daily intake of fat. Privitera and Freeman (2012) constructed a scale to measure or estimate the daily fat intake of participants; the scale was called the estimated daily intake scale for fat (EDIS-F). To validate the assertion that the EDIS-F could indeed estimate daily intake of fat, the researchers tested the extent to which scores on the scale could predict liking for a high-fat food (as would be expected if the scale were measuring daily fat intake). Liking was recorded such that higher scores indicated greater liking for the food. The researchers found that liking for the high-fat food (Y) could be predicted by scores on the EDIS-F (X) using the following regression equation: Y = 1.01X + 4.71. Using this regression equation:
(a) Is the correlation positive or negative? Explain.
(b) If a participant scores 40 on the EDIS-F, then what is the expected liking rating for the high-fat food?
It is reported that 45% of all college professors are extroverted. Suppose you have classes with six different professors. What is the probability that all six are extroverts?
For each value of z*, find the cumulative probability P(Z ≤ z*):- z* = 1.96. - z* = -2.33. - z* = 2.58. - z* = 1.65.
a researcher selects a sample of 80 people and records the frequency of participants choosing a low moderate or high
In stepwise regression, why might a predictor variable that correlates highly with the criterion variable not enter into the regression equation?
At α = .05, the hypothesis for the given issue is H0: Credits Earned and Certainty of Major are independent. Calculate the Chi-Square test statistic, degrees of freedom and the p-value
What is an interaction?- How many interactions can be tested in a 2 x 2 design? In a 3 x 3 design? In a 2 x 2 x 3 design?- Why do researchers use expericorr designs?
What percentage of values would you expect to be out of bounds when the process is in control? Accordingly, how would you define "too many"?
The government wants to estimate that percentage, so they take a random sample of 30 cars and compute the sample proportion that do not meet the standards.
Generalizations of the linear-by-linear model (7.11) analyze association between ordinal variables X and Y while controlling for a categorical variable that may be nominal or ordinal. The model with ordered scores {ui} and {vj } is a special case ..
a deck of cards is shuffled and you choose one at random observe its colour and replace it in the set. the cars are
Use the Poisson model to approximate the probability that there will be at least one major earthquake in the next 1000 days.
researchers can run t-tests on which type of variables?a a group variable and continuous variableb two criterian
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