valtricotinevh
2022-07-17
Answered

If the range of a data set is 24. Find the approx value of the standard deviation, using the range rule of thumb?

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emerhelienapj

Answered 2022-07-18
Author has **14** answers

The range rule tells us that the standard deviation of a sample is approximately equal to one fourth of the range of the data.

In other words $s=\frac{R}{r}=\frac{24}{4}=6$

In other words $s=\frac{R}{r}=\frac{24}{4}=6$

asked 2021-12-01

A study tested the claim that heights of Americans and heights of Austrians have different variances with $s=7.48092$ cm for Americans and 7.14756 cm for Austrians. The sample sizes are $n1=145\text{}{\textstyle \phantom{\rule{1em}{0ex}}}\text{and}{\textstyle \phantom{\rule{1em}{0ex}}}\text{}n2=157$ . When using the F test with these data, is it correct to reason that there is no need to check for normalcy because n1 is greater than 30, and n2 is greater than 30?

asked 2020-11-23

The accompanying two-way table was constructed using data in the article “Television Viewing and Physical Fitness in Adults” (Research Quarterly for Exercise and Sport, 1990: 315–320). The author hoped to determine whether time spent watching television is associated with cardiovascular fitness. Subjects were asked about their television-viewing habits and were classified as physically fit if they scored in the excellent or very good category on a step test. We include MINITAB output from a chi-squared analysis. The four TV groups corresponded to different amounts of time per day spent watching TV (0, 1–2, 3–4, or 5 or more hours). The 168 individuals represented in the first column were those judged physically fit. Expected counts appear below observed counts, and MINITAB displays the contribution to $\left({x}^{2}\right)$ from each cell.

State and test the appropriate hypotheses using $\alpha =0.05$

$\begin{array}{|cccc|}\hline & 1& 2& Total\\ 1& 35& 147& 182\\ & 25.48& 156.52& \\ 2& 101& 629& 730\\ & 102.20& 627.80& \\ 3& 28& 222& 250\\ & 35.00& 215.00& \\ 4& 4& 34& 38\\ & 5.32& 32.68& \\ Total& 168& 1032& 1200\\ \hline\end{array}$

$Chisq=3.557+0.579+0.014+0.002+1.400+0.228+0.328+0.053=6.161$

$df=3$

asked 2021-07-20

Study the scatterplots and rank correlations displayed in your classroom

asked 2021-12-11

From the same data, answer the following

- What is the probability that it is a male or in managerial position?

- What is the probability that it is neither male nor in managerial position

- What is the probability that it is female or clerical portion?

$$\begin{array}{|cccc|}\hline Position& Male& Female& Total\\ Managerial& 8& 4& 12\\ Engineer& 18& 7& 25\\ Accountant& 3& 5& 8\\ Clerical& 15& 28& 43\\ Total& 44& 44& 88\\ \hline\end{array}$$

- What is the probability that it is a male or in managerial position?

- What is the probability that it is neither male nor in managerial position

- What is the probability that it is female or clerical portion?

asked 2021-06-04

You randomly survey shoppers at a supermarket about whether they use reusable bags. Of 60 male shoppers 15 use reusable bags. Of 110 female shoppers, 60 use reusable bags. Organize your results in a two-way table. Include the marginal frequencies.

asked 2021-06-24

Refer to the Journal of Applied Psychology (Jan. 2011) study of the determinants of task performance. In addition to

Conscientiousness

Job Complexity

Emotional Stability

Organizational Citizenship

Counterproductive Work

asked 2020-11-29

Straight Lines Graph the straight lines in Exercises 1–3.

Then find the change in y for a one-unit change in x, find the point at which the line crosses the y-axis, and calculate the value of y when x 52.5.

1.

2.

3.

Scatterplots For the scatterplots in Exercises 5 describe the pattern that you see. How strong is the pattern? Do you see any outliers or clusters?

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