6. John is a data analyst at TikTok, and he is preparing a comprehensive report oncustomer engagement. Suppose the average session duration for a customer is normallydistributed with variance 6. If the session duration of 25 randomly selected customersare chosen. What is the probability that the sample variance is greater than 9.1?

Answered: 6. John is a data analyst at TikTok,…

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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Suppose the graduate teaching assistant for Intro Stat at the University of Florida also collected data on whether the students sat in the front of the class, middle of the class or back of the lecture hall. How much of the variance in the percentage grade is explained by the study hours and the sitting position?
8. The hourly wage for Georgia Tech student interns with statistics training has a known mean of $50 and an unknown variance. Sixteen students were randomly selected from this population and reported their hourly wages. The sample results are x = 52 and s = 8. What is the probability of observing a sample average of $52 or larger, when underlying mean hourly wage is actually $50?
1) The mean and variance of a sample of 25 data items are 78 and 100, respectively. Use Chebyshev's theorem to describe the distribution of the data.
An analysis of variance is used for the following data. What will happen if the value of M1 is changed from 15 to 20? Sample Data M1 = 15 M2 = 25 SS1 = 90 SS2 = 70 A)both SSbetween and the size of the F-ratio will increase. B)SSbetween will increase and the size of the F-ratio will decrease. C)SSbetween will decrease and the size of the F-ratio will increase. D)both SSbetween and the size of the F-ratio will decrease.
On a particular production line, the likelihood that a light bulb is defective is 5%. Ten light bulbs are randomly selected. What are the mean and variance of the number of defective bulbs?
One sample has n=7 and SS=35 and a second sample has n =17 and SS =45. What is the pooled variance for these two samples?
A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in Utah and Oregon. Due to recent trends in the childcare industry, the firm suspects that the mean annual income of childcare workers in Utah is less than the mean annual income of childcare workers in Oregon. To see if this is true, the firm selected a random sample of 20 childcare workers from Utah and an independent random sample of 20 childcare workers from Oregon and asked them to report their mean annual income. The data obtained were as follows. Annual income in dollars 27060 , 42320 , 36445 , 37895, 44564 , 35325 , 30313 , 28698, 33706 , 48365 , 26946 , 25063 , 28339 , 29265 , 40051 , 37026 , 40150 , 42753 , 27820, 39471 Utah 29769 , 48859 , 32480 , 36288,45102 , 46219 ,51098 , 45516 , 38834 , 44659 , 40755 , 38006 , 39947 , 29801 , 32200, 38731 , 41370 , 28059 , 33753 , 35271 Oregon Send data to calc... v Send data to Excel The population standard deviation for the annual incomes of…
An amusement park keeps track of the percentage of individuals with season passes according to age category. An independent tourist company would like to show that this distribution of age category for individuals buying season passes is different from what the amusement park claims. The tourist company randomly sampled 200 individuals entering the park with a season pass and recorded the number of individuals within each age category. Age Category Child (under 13 years old) Teen (13 to 19 years old) Adult (20 to 55 years old) Senior (56 years old and over) Number of Individuals 56 86 44 14 The tourist company will use the data to test the amusement park’s claim, which is reflected in the following null hypothesis. H0:pchild=0.23H0:pchild=0.23, pteen=0.45pteen=0.45, padult=0.20padult=0.20, and psenior=0.12psenior=0.12. What inference procedure will the company use to investigate whether or not the distribution of age category for individuals with season passes is…
6.8 Given a normal distribution with μ = 30 and o = 6, find a. the normal curve area to the right of x = 17; b. the normal curve area to the left of x = 22; c. the normal curve area between x = 32 and x = 41; d. the value of x that has 80% of the normal curve area to the left; e. the two values of a that contain the middle 75% of the normal curve area.
The goal of analysis of variance (ANOVA) is toa. detect differences in treatment variances (or variances for different populations).b. detect differences in treatment means (or means for different populations).c. analyze the average variances for different populations.d. analyze the variances of the variances for different populations.
7.Which of the values below is closest to the IQR for a normally distributed population with a variance of 36? chosse one: 5,6,7,8,9
In an analysis of variance with 4 groups, each containing 12 respondents. Please calculate the between-group degrees of freedom.

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