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Give an example representing a discrete probability distribution and a continuous probability distribution. Explain why your choice is discrete and continuous.
The calculated Z test statistic is a positive value that leads to a p-value of .045 for the test. If the significance level (α) is .01, the null hypothesis would be rejected.
In testing equality of two means below, determine the test statistic? (Use the equal variances formula)
Determine the mean and standard deviation of following probability distribution.
At the .05 significance level, can we conclude that there is a difference in their mean times?
Determine 95% confidence interval for the population mean, based on the sample mean.
Is the dependent variable discrete or continuous? interval, or ratio) is used to measure the dependent variable?
Run a simple regression of the dependent variable demand on the independent variable price and observe the coefficient on price.
When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. Make an interference based on the results of the study.
You draw two cards from a standard deck of 52 cards, but before you draw the second card, you put the first one back and reshuffle the deck.
Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
A population of scores forms a normal distribution with a mean of μ = 40 and a standard deviation of σ =12.
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