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What does a squared correlation coefficient represent? Also, does the strength of the correlation depend on the direction? Finally, does correlation imply causation.
For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion.
Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance.
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Compute the variance and standard deviation of the number that will arrive within two days.
A GSS asked. "What do you think is the ideal number of children for a family to have? the 497 female who responded had a median of 2, mean of 3.02 and standard deviation of 1.81 (a) Report the point estimate of the population mean.
Determining the probability that the two choose the same number?
Each vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages.
Research question: Are the mean crash damages the same for these three vehicles?
Sketch a scatter plot that could represent data from each of following. Label the axes to indicate the independent and dependent variable.
The calculated chi-square test statistic and the table value for a 0.05 significance level are:
Suppose that you perform a significance test regarding a population mean and that the evidence does not warrant rejection of the null hypothesis.
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