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Perception of Time- Randomly selected statistics students of the author participated in and experiment to test their ability to determine when 1 min(or 60 seconds) has passed. Forty students yeilded a sample mean of 58.3 sec. Assume σ that standard deviation = 9.5 sec.
If you draw one ball from the urn what is the probability that it is blue or white?
What is the probability of the person is 20 to 24 years old.What is the probability of the person is 20 to 34 years old.
Below you are given a partial computer output based on a sample of 21 observations, relating an independent variable (x) and a dependent variable (y).
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A group and the trace group? Implement the test in Problem 10.68, and report a two tailed p value.
Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of 100 students taken from this university, the GPAs have a mean of 2.95 and an SD of 0.55. Has the mean GPA ..
A certain type of injury has tangible costs of $40,000 per occurrence and intangible costs of $150,000 per occurrence. Perform a cost/benefit analysis to weigh the benefits of the proposed safety glasses policy against its expected costs.
Draw the OC curve. If the average number of defects increased by to 10 per tractor, what would the probability of detecting the shift in a control chart?
Compute the value of t. What is your decision regarding the null hypothesis?
When performing a chi-square test for independence, explain how the "cell frequencies under the independence assumption" are calculated.
How large a sample should be taken if the desired margin of error is?
At α = 0.10, can the researcher conclude that alcohol consumption is related to sex? What kind of Chi-Square test is this?
Whenever the calculated value of t is equal to or greater than the tabled value of t, for a given number of degrees of freedom, then
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