Illustration 10.28. Compile a table, showing the frequencies withwhich words of different numbers of letters occur in the extract repro-duced below (omitting punctuation marks) treating as the variable thenumber of letters in each word, and obtain the mean, median and co-efficient of variation of the distribution:"Success in the examination confers no absolute right to appoint-ment, unless Government is satisfied, after such equiry as may beconsidered neçessary, that the candidate is suitable in all respect forappointment to the public service."66

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Answered: tration 10.28. Compile a table, showing…

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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7 Compute (b) Looking at the normal quantile plot, describe the pattern to the plotted points. Choose the best answer. O The plotted points appear to approximately follow a straight line. O The plotted points appear to follow a curve (not a straight line) or there is no obvious pattern that the points follow. (c) Based on the correct description of the pattern of the points in the normal quantile plot, what can be concluded about the population of body lengths of the snakes on the island? O The population appears to be approximately normal. The population does not appear to be approximately normal, X
8) a bag contours 5 blue, 4 red. marbles. A sample of 4 is taken and without replacement. Set up a p-df. for the number of blue marbles in the sample. b) Find the mean, SD. C cf Find the prob that the proportion of blue marbles in the sample > 1½/2
9.13. Admissions during 1971 to 'Vidya Mandir,' and "Children's Home' increased by 20% and 40% respectively over those during 1970. If the admission in 1970 were 800 and 200 respectively find the mean increase in the admission of the two schools.
4. A group of 10 random high school students students were asked about their average study time per weekday, and the values are as followed: {4, 6, 8, 5, 2, 6, 5, 3, 8, 5} A) Find the unbiased estimator of the mean
The data below was collected for all 50 states in the US. Start by dividing the states into 2 groups:those with Poverty under 12% and those with Poverty at least 12 %. 1) Test the claim that the two groups have the same mean number of Gun Deaths.2) Test the claim that the two groups have the same mean number of High School Graduates 3) Test the claim that the two groups have the same mean number for Unemployment. 4) For each group, create a confidence interval for the number of Gun Deaths. How do they compare? 5) For each group, create a confidence interval for the number of High School Graduates. How do theycompare? 6) For each group, create a confidence interval for the number for Unemployment. How do they compare?
. You collected 10 years of daily data. Based on that you find first trading day of each month 's average return is 50 bps. Mean return for all days is 4 bps. Stdev across all days is 100 bps. Stdev for first day of each month only is 125 bps. Q3a. What is the mean return for trading days other than first day of the month? Q3b. Take the difference in sample mean for first day vs. other days. This is your point estimate for the difference b/w two types of days. What is that point estimate? What is stdev for the point estimate? Q3c. What is the probability of observing the point estimate above under the null hypothesis that the true difference is zero (this is known as p-value)? Q3d. What is the 95% Confidence interval for the point estimate? At 95% confidence, should you reject or accept that first days’ mean return is not different from other days of the month?
8. A researcher is interested in knowing whether the proportion of childless couples in a community deviates significantly from the statewide average of 0.12. A sample of 150 couples is interviewed, and the mean proportion of childless couple in this sample is 0.17. Can you determine whether the researcher should accept the notion that the "true" proportion could be 0.12? 9. A survey of two local communities is conducted to see whether there is difference in the mean lengths of unemployment. Sample information, Community A: sample mean =12.4 months, s=3, n=15; Community B: sample mean =14.4 months, s=4, n=15. Is there a significant difference? Assuming equal variances, state the null and alternative hypotheses, and test the null hypothesis, using a=0.05. Find p=values and a 95% confidence interval for the difference. 10. Using the following hypothetical data: (a) Find the mean and standard deviation for each day of the week. (b) Use SPSS to carry out Levene's test to determine whether…
25) A data set has a mean equals (7), if we multiply all values of the data set by (3), then the mean will become (21). Select one: True False
lecture(12.10b): when we comparing two unrelated sample group we use the --------------------------. When we are comparing two related ,because they are matched we use the........................ and when we are comparing three or more groups we use the....................................
B5: a) [10] For the data set X = {1,2,6 ,2,8,6,5,2,4}, determine; i) The range and the mode. ii) The median and the inter-quartile range. The mean I and the standard deviation o (to 2 digit accuracy). b) [5] You want to display graphically some crime statistics of the incidence of four categories of crime for each of the last five years. You will need the graphic to show changes in both the total crime and the relative incidence of the four categories over this period. What sort of statistical diagram would you use, and why?
The Table below shows the average score of the150 students sampled from theUniversity of the East Europe in the academic year 2020/2021.Score (out of 100) Number of students40-49 1950-59 3260-69 4970-79 2980-89 21i. calculate the mean score of the students ii. identify the modal score iii. identify the median score iv. Use your results above to comment on the shape of the distribution. Give a reason for youranswer.
13. Twenty-five students were randomly selected and asked “How many hours of TV did you watch this weekend?" The sample mean for the data is = 5 hours. The dotplot below shows the distribution of the sample mean hours of TV watched for 500 random samples of size 25 taken with replacement from the original sample. (a) Use the results of the simulation to approximate the margin of error for the estimate of the mean number of hours of television watched. (b) Interpret the margin of error. 4.5 Simulated sample mean 5.5 Distribution of Simulated Mean #samples mean SD 500 4.969 0.288

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