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Make up a scatter diagram with 10 dots for each of the following situations: (a) perfect positive linear correlation, (b) large but not perfect positive linear correlation, (c) small positive linear correlation, (d) large but not perfect negative linear correlation, (e) no correlation, (f) clear curvilinear correlation.
A sample of 50 customers resulted in a sample mean of $90. What is the probability of obtaining a sample with a sample mean smaller than $90?
Why is the F distribution important? How do you determine if a significant difference exists among the groups in ANOVA? How do you determine differences between the groups in ANOVA?
Do women and men have different opinions about affirmative action? Based on a sub sample of 2008 GSS, the output figure below shows respondent's sex (sex) and attitudes toward affirmative action (DISCAFF: Are whites hurt by affirmative action).
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? State the null hypothesis and the alternate hypothesis.
How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?
Develop a point estimate of the population mean number of units sold per month. Develop a point estimate of the population standard deviation
A circus clown at the top of a 60-foot platform is playing catch with another clown on the ground. The clown on the platform drops a ball at the same time as the one on the ground tosses a ball upward at 80 ft/sec.
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
In Excel, which of the following functions is used to conduct a hypothesis test (using the p -value) for a population variance
SAT verbal scores are normally distributed with a mean of 412 and a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lie between 412 and 592.
In a sample of 4 items, what is the probability that exactly 3 are acceptable? Assume the samples are drawn without replacement. (Round your answer to 4 decimal places.)
Use the given confidence level and sample data to find a confidence interval for estimating the population mean
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