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The standard deviation of the distribution of means of change scores is 2.0 and the mean change score for the sample studied is an increase of 5.2. What is considered a medium effect size for a t test for dependent means?
Consider that measurement 2 (M2) in random sample of 1000 controls from the Disease Y study population follows the normal distribution.
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
Suppose that weights of bags of potato chips coming from a factory follow a normal distribution with mean 12.8 ounces and standard deviation .6 ounces.
How does a linear regression allow us to better estimate trends, costs, and other factors in complex situations?
In an attempt to justify this claim, the representative will poll a randomly selected sample of dish owners. The probability that none of the dish owners in the sample subscribes to at least one premium movie channel.
Assume a random sample of 16 gasoline stations is selected and their mean cost for regular gasoline is computed. What is the standard error of the mean in this experiment?
A food snack manufacturer samples 13 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 14.7 oz. and the sample standard deviation is 0.50 oz., find the 95% confidence interval of the true mean.
A sample of 25 students enrolled in the university indicates that X (bar) = $315.4 and s = $43.20.
The average price of a home is reported to be $203,190. Use this price as the population mean, and assume the population standard deviation is 43,890.
Define or give an example of a hypothetical construct. Explain why operational definitions are needed to define and to measure constructs.
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.
Give a 99% confidence interval for the proportion of adults who attended church or synagogue during the week preceding the poll.
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