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A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population. The population is normally distributed and sigma is unknown. When constructing the confidence interval, the researcher should use the t distribution; however, she incorrectly uses the normal distribution. Will the true confidence level of the resulting confidence interval be greater than 95%, smaller than 95%, or exactly 95%?
A consumer organization wants to know whether there is a difference in the price of a particular toy at three different types of stores.The price of the toy was checked in a sample of five discount stores, five variety stores, and five department ..
Post-hoc fallacy is that condition where regression shows a high degree of correlation (R square is high), but there is no real cause-effect relationship between the independent and dependent variables.
Assume that the population is 0.55. Compute the standard error of the sample proportion for the following sample sizes:
Explain finding value of test statistic and P-value also understand the result. At the .01 significance level can we compute that the mean fare has increased.
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution.
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
Would it be sensible to conclude that more than 10% of applicants are now failing the test?
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
In an online survey of 4001 respondents, 8% were classified as productivity enhancers who are comfortable with technology and use the internet for its practical value. Suppose you select a sample of 400 students at your school, and the population ..
Assume that you choose a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
What is the real world value of the y-intercept and slope in a regression equation? Other than statistics problems, why should I care?
At 0.01 level of significance, is there evidence that mean price is higher at Whole Foods Market than at Fairyway supermarket? Interpret the meaning of p-value in (i).
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