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Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern. Describe and give examples of research questions in which internal validity is a primary concern. Discuss strategies researchers use in order to make strong claims about the applicability of their findings to a target population.
Testing for Population mean - Based on this sample evidence, is Joan's supervisor correct? Use a = .05.
Test whether the weight reducers on average will lose less than 10 pounds using P-value approach.
Of the nine members of the board of trustees of a college, five agree with president on a certain issue. The president selects three trustees at random and asks for their opinions. What is the probability that at least two of them would agree with..
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
Do the data from this sample provide evidence for a significant increase in REM activity during exams? Use a one-tailed test with _ = .01. B.) Compute Cohen's d to estimate the size of the effect.
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
For following set of scores, prepare a frequency distribution, a histogram, and a stem-and-leaf display for each variable. Also calculate the mean, the median and the standard deviation of each score.
Design a contingency table that will hold your data. What are your degrees of freedom and critical value at a 0.05 confidence level? You do not need data to answer this.
Statistics practice questions answers in a correct order and if possible copy all the graphs in excel. How large a sample size (trading days) is needed to estimate the population mean number of shares traded per day to within 100 million with 95% co..
Diastolic blood pressure (DBP) values were measured for 150 patients using two medical devices. The mean DBP values using the two devices are 120 and 122 respectively. Also the standard deviation of the difference of the measurements is 0.634. Te..
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
Find the probability that he will answer all 10 questions correctly.
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