Illustration. 20.25. Two investigators study the income of agroup of persons by the method of sampling. Following results w?rOobtained by them:InvestigatorРоorMiddle classWell-to doTotalA160301020014030012040300Total1 50Show that sampling technique of at least one of the investigator50500is suspect.

Answered: Image /qna-images/answer/e209398a-6ead-42ef-98b8-68d20db39d5c.jpg

Answered: Illustration. 20.25. Two investigators…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Do question 2
2. Calculate Karl-person's coefficient of skewness for the following data. 25,15,23, 40, 27, 25, 23, 25, 20
c. this test statistic for this data= d. the p-value for this sample=
2. This is a sample of 10 random seasons in the National Hockey League, Wayne Gretzky scored50% more points than anyone who ever played professional hockey. He accomplished this amazingfeat while playing in 280 fewer games than Gordie Howe, the previous record holder. Here are thenumber of games Gretzky played during each season.45 70 73 73 74 78 79 80 80 82 c.Are there any outliers in the data? Show work and identify which value(s) if any are outliers. d.Construct a boxplot for the data
5. The dot plot below represents the numper of nits per game for two randomly selected players. What is the median for the number of hits for each player? Johnny Paulo 2 4 6. 8 10 Number of Hits per Game Johnny: 3 hits per game Paulo: 2 hits per game Johnny: 4 hits per game Paulo: 3 hits per game Johnny: 4 hits per game Paulo: 5 hits per game Johnny: 3 hits per game Paulo: 3 hits per game O000 O00000- 00 00-
Following are the heights of a random sample of 12 fathers (X) and the corresponding heights of their eldest sons (Y) in inches. X: 65, 63, 67, 64, 68, 62, 70, 66, 68, 67, 69, 71 Y: 68, 66, 68, 65, 69, 66, 68, 65, 71, 67, 68, 70 Which group has the less variable heights based on the coefficient of variation? Answer X or Y. Report the corresponding CV (in %) in 2 decimal places beside your first answer, separated by a comma.
Short Answer 3: Thirty students were surveyed as to their ethnicity, and the following was the data: Hisp. White Asian Hisp. Afr. White Afr. Hisp. Asian Hisp. Hisp. White White White Hisp. White Afr. Hisp. Hisp. Hisp. Hisp. White Hisp. White Afr. White Afr. Hisp. White Hisp. Graph a bar chart and a pie chart BY HAND, and upload them to this question using the "File Upload" feature!
a. Write a table with observations for these samples. b. Using the table, explain (calculate) where the S=1.22 comes from c. Conduct a two-tailed comparison of the two groups with a=.05. Please remember to state your hypothesis. Now look at: d. Write a table with observations for these samples. e. Using the table, explain (calculate) where the S=6.65 comes from f. Conduct a two-tailed comparison of the two groups with a=.05. g. What changed between [a-c] and [d-f]? what impact did it have?
4. Find each value requested for the distribution of scores in the following table. а. п b. ΣΧ C. Σχ f 1 4 2 3 3 2 5 1 3 UNG
3. For the following scores, od arw noitslomo odi To1 pismiteo airi diw in Y noizasngon ordi lo mmol noitsupe noiaa0 7 4 xMd-M 7 d onartw 6. 00.S+ = (A) 4 7 bns 00.1 a. Sketch a scatter plot showing the six data points. b. Just looking at the scatter plot, estimate the value d of the Pearson correlation. 16 c. Compute the Pearson correlation. lo tluan orh ons nols on n ar Sistino ala 254 r~4
. What percent of the random samples from Bag 1 had between 30% and 50% red marbles? What percent of the random samples from Bag 2 had between 30% and 50% red marbles? f. What percent of the random samples from Bag 1 had between 70% and 90% red marbles? What percent of the random samples from Bag 2 had between 70% and 90% red marbles? g. Which bag is more likely to be the one with 40% red marbles and which bag is more likely to be the one with 80% red marbles? Why? h. A third bag of 50 marbles contains 50% red marbles and 50% black marbles. If students take random samples of 10 marbles from that bag, how do you think a dot plot for those random samples would compare to the dot plots for Bag 1 and Bag 2?
. The data of amputee percentage is shown below. Group this data for Intervals start from 10%-20%. Calcul ate the mean, mode, medi an for the grouped data and compare between them. Draw the suitable graph for the resulting grouped data and state the cause of using this graph. 60% 57% 70% 21% 50% 53% 27% 28% 29% 60% 11% 27% 48% 35% 62% 43% 45% 23% 34% 20% 29% 13% 36% 43% 59% 62% 50% 31% 21% 56% 46% 14% 60% 48% 40% 45% 49% 52% 44% 63%

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