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The probability that the individual egg in the carton of eggs is cracked is 0.03. You have picked out the carton of 1 dozen eggs (that's 12 eggs) at grocery store. Find out the probability that at most two of eggs in carton are cracked.
(a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
When would you use hypothesis testing and when would you use confidence intervals?
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of µ = 80 and a standard deviation of σ = 20. The researcher expects a 12 point treatment effect and plans to use a ..
An investigator wants to design a study to estimate the difference in the proportions of men and women who develop early onset cardiovascular disease
Calculate mean and SS for sample of difference scores.
The amount of corn chips dispensed into a 10 ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 10.5 ounces and a standard deviation of .2 ounces.
If you randomly assign participants to groups, can you suppose the groups are equivalent at the beginning of the study?
What is correlation? Does correlation directly support causation, what are both sides of the argument?
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
Strack, Martin, and Stepper (1988) found that people rated cartoons as funnier when holding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them to frown). For this study, identify the independ..
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