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Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern. Describe and give examples of research questions in which internal validity is a primary concern. Discuss strategies researchers use in order to make strong claims about the applicability of their findings to a target population.
An automotive expert claims that the large number of self-serve gasoline stations has resulted in poor automobile maintenance, and that the average tire pressure is more than 4 pounds per square inch (psi) below its manufacturer's specification.
Determine the mean number of times the machine was used per day.
Drawing the standard normal curve and indicating the area representing the probability and
If p denotes the p -value of the corresponding hypothesis test, which of the following is true?
Find the 99% confidence interval for the population proportion.
95% of breaking strengths will be contained between what two values symmetrically distributed around mean?
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
When the names of all the students at Omega University were dropped to a fishbowl, they would include:
If student is chosen at random, determine the probability that he or she is sophomore and owns a credit card.
Use this information to construct a probability table, and then calculate each of the following probabilities: P(foreign car)
What is the stock's value at it's highest on 15 days of the year? (Assume that there are 240 trading days in a year).
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