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A clinical psychologist is interested in the effect that anxiety has on the ability of individuals to learn new material. She is also interested in whether the effect of anxiety depends on the difficulty of the new material. An experiment is conducted in which there are three levels of anxiety (high, medium, and low) and three levels of difficulty (high, medium, and low) for the material, which is to be learned. Out of a pool of volunteers, 15 low-anxious, 15 medium-anxious, and 15 high-anxious participants are selected and randomly assigned five each to the three difficulty levels. Each subject is given 30 minutes to learn the new material, after which the participants are tested to see how much they learned. Which statistical test should the researcher use to analyze the data?
a.) chi square
b.) independent samples t-test
c.) one-way analysis of variance (ANOVA)
d.) two-way analysis of variance (ANOVA)
suppose that since the early 1950s some ten-thousand independent ufo sightings have been reported to civil
Prepare a bank reconciliation using Bobby Barnacles' Restaurant Supply Inc's information for August 31.
Determine the probability that the project will be completed in 80 days or less.
What percentage of the pins will be acceptable to the customer? In order to improve percentage accepted, the production manager and the engineers discussadjusting the population mean and standard deviation of the length of the pins.
Find the standard error of the mean Also establish an interval estimate around the sample mean using one standard deviation of the mean.
If sales invoices are automatically calculated and posted by a company's computer system, can the auditor reduce substantive tests of transactions for the accuracy objective? Why?
Using the .05 level, what should the experimenter conclude? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
the number of kernels of corn in a bag of microwave popcorn is 1262 with a standard deviation of 118 kernels.
Indicate which distribution to use in order to find confidence intervals for the unknown population mean from a random sample taken from the population
iq as measured by an intelligence test is scaled so that the mean in the population is 100 with a standard deviation of
Using the Activity data file, perform two single factor ANOVAs: one using SystolicBP and one using DiastolicBP as the dependent variable - perform post hoc analyses to determine which groups actually differ.
The probability that student pilot passes the written test for a private pilot's license is 0.7. Find the probability that the student will pass the test: (a) on the third attempt (b) before the fourth attempt.
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