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Think about a real world situation or problem that could be addressed using a single-sample t test. For this situation or problem, clearly identify the independent and dependent variables you would study; generate the statistical null and alternative hypotheses; describe what information the effect size would tell you that the probability value would not; using realistic numbers for values of degrees of freedom, sample size, and t statistic, report hypothetical results in a few sentences.
For the following cases, determine whether the sampling is dependent or independent. Explain your conclusion.
A human society claims that less than 36% of US. households own a dog. In random sample of 397 U. S. households, 151 say they own a dog. At mean=0.03, is there enough evidence to support the society's claim?
If you were using the relative frequency of an event to estimate the probablility of the event, would it be better to use 100 trials or 400 trials according to the law of large numbers?
Determine the mean and the standard deviation of the following frequency distribution. (Round your answers to 2 decimal places.)
With a major expansion planned, Judy projects sales next year to increase to 1,200 radials. What will the demand be each season? Please show work (formulas).
Your company builds roads, bridges, schools and other multi-million dollar public construction projects. Competitive bids are made for the contracts to undertake these projects. For each project there are three costs:
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
A company ships computer components in boxes that contain 20 iteams. Assume the probability of a defective component is .4. use the geometric distribution to find the probability that the first defect is found in the third or fourth component test..
Construct a frequency distribution (class, tally and frequency) for the data set using the indicated number of classes. In the table, include the midpoint, relative frequencies and cumulative frequencies.
The number of degrees of freedom associated with the t test, when the data are gathered from a matched pairs experiment with 13 pairs, is:
Why do so many of life's events share the same characteristics with Central Limit Theorem? Why are estimations and confidence intervals important?
After treatment is administered to individuals in sample, sample mean is found to be M = 55. Determine Cohen's d measure effect size for both tests (σ = 20 and σ = 10).
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