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Below is a 6 × 8 array containing the ages of moviegoers (see file HarryPotter). Trea this as a population. Select a random sample of 8 moviegoers' ages by using (a) simple random sampling with a random number table, (b) simple random sampling with Excel's =RANDBETWEEN( function, (c) systematic sampling, (d) judgment sampling, and (e) convenience sampling. Explain your methods. 32 34 33 12 57 13 58 16 23 23 62 65 35 15 17 20 14 11 51 33 31 13 11 58 23 10 63 34 12 15 62 13 40 11 18 62 64 30 42 20 21 56 11 51 38 49 15 21
Determine the probability, P(Z
What is a nonparametric procedure? Describe specifically when you would utilize a nonparametric test. Under what conditions should you use the Wilcoxon sum rank test?
The personnel office at a large electronics firm regularly schedules job interviews and maintains records of the interviews. From the past records
After computing a confidence interval, the investigator believes that the results are meaningless because the width of the interval is too large. In reconstructing the interval, the investigator should: decrease the sample size.
For the population with standard deviation of σ =10 a score of x=44 corresponds to z= -0.50. Determine the population mean?
You have at least $30 in change in your drawer, consisting of dimes and quarters. Write an inequality that shows the different number of coins in your drawer.
Calculate the measures of central tendency, dispersion, and skew for your data. Display your descriptive statistical data using graphic and tabular techniques.
What is the relationship between the value for degrees of freedom and the shape of the t distribution? What happens to the critical value of t for a particular alpha level of df increases in value?
30% of the college of business students major in finance. A random sample of 20 students is selected. What is the probability that no more than 3 students of the selected students are majoring in finance?
The mean construction time for a standard two-car garage by Arrowhead Construction Company is 3.5 days. The time for the construction process follows the normal distribution.
How would you find the normal approximation to the binomial probability P(x = 5) in part A? Please show how you would calculate µ and σ in the formula for the normal approximation to the binomial, and show the final formula you would use without g..
Chi-square tests are great to show if distributions differ or if two variables interact in producing outcomes. What are some examples of variables that you might want to check using the chi-square tests? What would these results tell you?
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