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Find a dataset: approximately 30-100 scores or observations. Write a null and alternative hypothesis, conduct a statistical significance test (in SPSS or Excel), and tell what decision you'd make about the null hypothesis, and why. You'll need to include your SPSS or Excel output.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior. Among the questions asked was "do you enjoy shopping for clothing?" Of 240 males, 136 answered yes.
What the information do z-scores give that actual heights do no?
Create one table that calculates summary measures of the change in test scores and income variables across all 80 schools.
Using the original data, test at the 5% significance level that the population standard deviation of studying times is greater than 4 hours.
According to Chebyshev's theorem, proportion of values from data set that is further than 2 standard deviations from the mean is at most?
Is this statistically significant evidence that candidate has sufficient valid signatures overall? Describe.
The Smoky Bear Trucking Company claims the average weight of a fully loaded moving van is 12,000 lb. The highway patrol decides to check this claim.
Interpret coefficient on log (salesm). If salesm were to be increased by 20%, what would be estimated change in mktgp? Would this effect be substantive?
According to Central Limit Theorem, how big of sample is essential to be sure sampling distribution of sample means is normally distributed.
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
The linear correlation coefficient, r, measures the strength of the linear relationship the variables in a set of ordered pairs (x,y). What is the maximum and minimum values for r?
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