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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?
Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). The interquartile range of the salaries will
When the names of all the students at Omega University were dropped to a fishbowl, they would include:
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
Calculate mean and SS for sample of difference scores.
How closely is the height of an individual related to the weight? Partial regression output for a sample of 92 individuals is below.
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?
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
Assume you want to repeat the FDA experiment to achieve an estimation of the mean μ of the amount of caffeine content of a cup of coffee.
Find out the sample size raised by mean also standard deviation, a sampling distribution may approach among which of the following values.
Find out the following probabilities. Probability that exactly 27 items will be good.
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