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Psychologists were interested in seeing whether kids were better at finding hidden objects with their parents present or without their parents present. Their hypothesis was: H0: the parents' presence does not affect how many objects their kid can find. Ha: kids find all objects with their parents present. They carried out the experiment and calculated a one-tailed p-value of p=0.05. Answer questions 3-4.
Were the researchers correct in running a one-tailed test?
Yes, because they are testing whether kids are very good at finding hidden objects or very bad at finding hidden objects with parents present.
Yes, because they are interested in determining if parents make their kids better at finding hidden objects.
No, they should've done a two-tailed test because they are testing whether kids are very good at finding hidden objects or very bad at finding hidden objects with parents present.
No, they should've done a two-tailed test because we know that kids are better at finding hidden objects with their parents present.
According to Money, the average cost of repairing a broken leg is $10,402, and the average cost of repairing a knee injury is $11,359. - Conduct a test for equality of means using α = 0.05.
In a certain county, 27% of registered voters are Republicans, 20% are Democrats, and the rest are Independents. 34% of Republicans oppose increased military.
The same sample of senior citizens reports that they belong to an average of 2.1 voluntary organizations and clubs, with a standard deviation of 0.5.
a production facility employs 20 workers on the day shift 15 workers on the swing shift and 10 workers on the graveyard
The profit of a certain outdoor activity depends upon the number of hours of sun shine through the formula profit = 1000(1 - e-x110). Find the expected level of the profit.
Assuming and are independent, find the probability that the hits will be located within an annular ring of width located a distance from the origin;
Given that she does receive the offer, how certain should she be that she received a strong recommendation?
What is the probability that a worker at Random drives more that 15 miles to work if the distribution of all worker's mileage is a Normal Distribution that ranges from 4 miles to 26 miles?
Describe the collapse of the Soviet Union. Begin with the events during the 1980s including the entire Gorbachev era. Should include at least the following topics:
Please explain by using the traditional methods for testing hypotheses and showing the results of all steps in the process.
Consider these three variables: finishing times in a marathon, number of university dining hall meals eaten in a semester on a three-meal-a-day plan.
A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in Europe.
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