22. A statistician wants to test for the equality of means in two independent samplesdrawn from normal populations of people enrolled in a diet program. However, hewill not perform the equal-variance t-test of the difference between the populationmeans if the condition necessary for its use is not satisfied. The number of poundlost at the completion of the program data follow:Sample 1Sample 2729256915157101018851222 273Can the statistician conclude at the 5% significance level that the required condition isnot satisfied (i.e. the population variances differ)?

atistician wants to test for the equality of me rawn from normal populations of people enroll will not perform the equal-variance t-test of the means if the condition necessary for its use is n ost at the completion of the program data follor

atistician wants to test for the equality of me rawn from normal populations of people enroll will not perform the equal-variance t-test of the means if the condition necessary for its use is n ost at the completion of the program data follor

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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Can u please answer all parts to number 8 quickly
When S successes occur in n trials, the sample proportion pˆ =S/n is customarily used as an estimator of the probability of success p. However, sometimes there are good reasons to use the estimator pˆ*= (S+1)/(n+2) a) Find the MSE (Mean Squared Error) of pˆ (phat). b) Find the bias of pˆ* (phat*). What is the value of the bias if p=0.4? c) Suppose that it is known that p is close to 0.4 and n=1,000. Which estimator would you prefer?
This output represents the hypothesis test that the average age at first pregnancy of women diagnosed with breast cancer is different depending on whether or not metastases are present (yes or no) at the time of breast cancer diagnosis.
A research study was conducted about gender differences in 'sexting'. The researcher believed that the proportion of girls involved in 'sexting' is different from the proportion of boys involved. The data collected in the spring of among a random sample of middle and high school students in a large school district in is summarized next: out of 380 females 43 sent 'sexts' and out of 410 males 64 sent 'sexts'. Is the proportion of girls sending sexts different from the proportion of boys 'sexting'? Choose the appropriate procedure. Procedure: Assumptions: (select everything that applies) Population standard deviations are known Normal populations Sample sizes are both greater than 30 Population standard deviation are unknown but assumed equal Paired samples Population standard deviation are unknown Simple random samples The number of positive and negative responses are both greater than 10 for both samples Independent samples
The null hypothesis for a repeated-measures test states O cach individual will have a difference score of D-0 the overall sample will have a mean difference of Mo -0 O the entire population will have a mean difference of do -0 O Allof the other options are correct
"STA3000Y - Advanced Theory of Statistics" is a graduate course taught at UTSG, which can only be taken by PhD students in the Department of Statistical Sciences. Assume the class consists of N = 8 students. The final marks in the course are: 95, 66, 71, 93, 75, 88, 68, 100 Find o?, the population variance. Show all the steps. Do not use any statistical package/excel here. For example, do not copy the final answer from R or from excel. Circle the final answer. Based on a simple random sample (without replacement) of size 4 selected from this class, find the exact variance of the sample total. Show all the steps. Circle the final answer. Based on a simple random sample (with replacement) of size 4 selected from this class, find the exact variance of the sample total. Show all the steps. Circle the final answer. According to the graduate school, a student fails a course if a student scores less than 72. Based on a simple random sample (without replacement) of size 4 selected from this…
A local DMV (location of your choice) wanted to assess the number of mistakes that were made by its operators (aka clerks). One hundred samples were gathered from each of 20 operators (note: n = 100 for calculation of σp but you will need 100 * 20 to calculate p-bar). The results are shown in the table below. The DMV wants to set control limits to include 95% of the random variation. Operator # Number of errors Fraction defective Operator # Number of errors Fraction defective 1 6 11 6 2 5 12 1 3 0 13 8 4 1 14 7 5 4 15 5 6 2 16 4 7 5 17 11 8 3 18 3 9 3 19 0 10 2 20 4 Calculate p-bar and σp. Complete the fractions defective in chart. Compute the control limits and center line for a p-chart. Plot the fraction defective in a p-chart and decide if the performance of the operators is…