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On a certain anxiety questionnaire, the population is known to have a mean of 12 and a standard deviation of 2.3. A higher score represents higher levels of anxiety. Participants in a new relaxation program complete the questionnaire after completing the program and have a mean score of 10.2. What is the effect size of the relaxation program?
In a study comparing individual performance with group performance, Laughlin, Zander, Knievel, and Tan found that groups consistently outperformed the best of the individuals.
a web based software company is interested in estimating the proportion of individuals who use the firefox browser. in
Test the manager's claim at 5% and 1% significance level tests.
Calculate the difference in the average "clutter" between network and TV.
how can standardized z-scores be used to compare people across different contexts such as the batting averages of two
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
the previous exercise is very important to your understanding of tests of significance. if you dont use the applet you
a random variable x takes values between 0 and 4 with cumulative distribution function fx x216 for 0 ? x ? 4.what is
a rare disease occurs in about 1 out of 1000 people who are similar to you. a test for the disease has sensitivity of
Would you classify these data as time series or cross-sectional and which of the variables are quantitative and which are qualitative?
determine the sample size needed to construct a 95 confidence interval to estimate the population mean for the
Airline Travelers often choose which airport to fly from based on flight cost. Cost data (in dollars) for a sample of flights to eight cities from Dayton, Ohio, and Louisville, Kentucky, were collected to help determine which of the two airports was ..
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