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An advertising executive hypothesized the use of clay puppets in a TV ad would be rated as more interesting than humans, by a test audience. She randomly assigned subjects into two test groups. Test her hypothesis at alpha= .05. Here are her findings:
Clay pupped mean= 94, S=3, N=9 . Human actors mean=92, S=4, N=8
T=
One or two tailed test?
T critical value=
Ho=
H1=
Reject or fail to reject Ho?
A sample of 33 observations is selected from a normal population. The sample mean is 30, and the population standard deviation is 4. Conduct the following test of hypothesis using the 0.05 significance level.
What is the population of interest to the researcher?- Identify the sample.- What inference was made by the researcher?- How might the nonresponses impact the inference?
Determine the test statistic. Determine the P-value. What is the result of this hypothesis test?
questionthe effect of exercise on the amount of lactic acid in the blood of sportsmen was examined in a study. eight
Conduct a test to compare the variation in hydrogen readings for the two sampling schemes.- Test using α = .05.
The heights of 18 year old men are approximately normally distributed with mean 68 inches and a SD of 3 inches.
If you randomly sample a single observation and get 32, what is the estimate of the population mean, µ? Can you get an estimate of the squared standard error?
A position control system for a DC motor is shown in Figure AP7.8. Obtain the root locus for the velocity feedback constant K, and select K so that all the roots of the characteristic equation are real (two are equal and real).
The population mean for all 123 women was 64.6 inches. Is this evidence that the sampling procedure was biased? Explain.
Given that the landowner pays for the soundings test and the test indicates that gas is present, what is the landowner's revised estimate of the probability of finding gas in this site?
The purpose of these four trials was to discover the effects of" these two alloying elements (nickel and manganese) on the breaking strength of a certain
Children's fitness is assessed by finding the distance, in meters, that they can run in 6 minutes. Overall, this distance varies fairly normally
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