30% of students have a bank account. If 40 independent students are randomly selected. Find the variance number of students have a bank account. Select one: Оа. 8.4 O b. 10.5 Ос. 2.1 O d. 4.2 Ое. 6.3

Q: One researcher collected a sample of expenses for advertisement from 5 companies as follows: 50, 60,…

A: The sample mean is, x¯=∑xn=50+60+55+58+725=2955=59 The sample mean is 59.

Q: A sample was taken of the salaries of four employees from a large company. The following are their…

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Q: Suppose 4 percent of the children in the US are thought to be near the juvenile diabetes threshold.…

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Q: A company that manufacturers wooden products (e.g. garden furniture, ladders, benches) regularly…

A: Hi, thanks for posting the question. The question contains more than three subparts, I am able to…

Q: The sample variance of 0,-3,3 is O none O 9 O 4 O 3 6

A: According to the given information, we have Data set:  0, -3, 3

Q: From 40 data points (x1, y1), .., (x40, Y40), assume that we approximate the means and variances as…

A: Given that, n=no. of data points n=40 x=5.16 y=41.2 sx2=9.55 sx=3.09 sy2=537.7 sy=23.18 sxy=71.5

Q: One sample has n = 6 and M = 10. A second sample has n = 4 scores with M = 15. If the two samples…

A: Combined mean = n1x1¯+n2x2¯n1+n2

Q: Solve for Q, P88, D10, Variance, Standard Deviation, Kurtosis and Skewness. 56 28 42 56 47 39 62 60…

A: given than=40

Q: If 80% of the applicants are able to pass driver’s proficiency road test, find the mean, variance,…

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Q: When testing for the difference between 2 population variances with sample sizes of n1=8 and n2=10,…

A:

Q: Find the sample variance of the following data set.  6,12, 11, 11

A: Solution : Given : n= 4 Let, X = 6, 12, 11, 11 Sample variance is calculated by using following…

Q: The following are final grades (in terms of percentages) from a class of 20 students. 70 2 75 70 84…

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Q: A 10-item multiple choices test has four choices. Each student randomly answers all of the questions…

A: n=10 p is the probability of selecting a correct answer from four choices. p=1/4 X is a random…

Q: ) If the probability of a student receiving financial aid is 0.72, find the mean and variance of the…

A: Given: probability of a student receiving financial aid is 0.72 p=0.72 number of students(n)=40000

Q: Find the variance of the given population. -10, -11, -12, 12, 11, 2, 11, 22 O 165.84 O 135.67 O…

A:

Q: If the readings are 23 4 the variance is-----

A: The question is based on descriptive statistics Given data : 2, 3 and 4

Q: One sample with n=4 scores has a mean of 12, and a second sample with n=6 scores has a mean of 8.…

A: Given information Sample 1 n1 = 4, µ1= 12 Sample 2 n2 = 6, µ2= 8

Q: A resort employs 3,500 managers and staff. To ascertain their employees' opinions of a proposed…

A: The parameter is the characteristic which is based on whole population. And the statistic is the…

Q: For an analysis of variance comparing six treatment means with a separate sample of n = 7…

A: From the provided information, Number of treatment (k) = 6 Number of participants in each treatment…

Q: A simple random sample of 28 observations was taken from a large population. The sample mean equaled…

A: It is given that, a simple random sample of 28 observations was taken from a large population with…

Q: The two-way table represents the results of a random survey taken to determine the preferred vehicle…

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Q: In a population where 27% of voters prefer Candidate A, how many voters must be sampled for the…

A:

Q: Assume you did an experiment with 3 groups and 16 subjects per group. The sample variances in the…

A: It is given that, an experiment with 3 groups and 16 subjects in per group. Thus,

Q: In the formula for an analysis of variance, we want between-group variance to be and within group…

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Q: How many subjects participated in an independent-samples t-test if a researcher reports, t (20) =…

A: Given information- We have given an independent-samples t-test. The value of test statistics is- t…

Q: One sample of n = 4 scores has a mean of M = 12, and a second smaple with n = 6 scores has a mean of…

A:

Q: Of the electric bills for a samle of 40 families Electric bill Number of families 2 12-16 14 4-8…

A:

Q: If a sample of 362 customers is taken from a population of 5530 customers, the sample variance, s,…

A: Solution -Given that  Sample size n=362 Population size N=5530

Q: Find the variance for the population consisting of the measurements ½, ¼, 1/3, ½, and 1/8 by using…

A: The population mean is, μ=∑XN=12+6+8+12+35=415=8.2 The population mean is 8.2.

Q: Question: 2. In order to determine the average weight of carry-on luggage by passengers in airp…

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Q: Blank are more representative of a population, but blank are easier to obtain

A: The sample is a set of units that is obtained from a population, which represents the population.…

Q: If two samples have the same n, then the pooled variance will be the average of the two sample…

A: Statement: " If two samples have the same n, then the pooled variance will be the average of the two…

Q: 4. Out of 450 randomly selected people in a soccer match, 225 of them were students. Compute the…

A: 450 people are selected randomly; n=450 225 of them were students; x=225

Q: An automotive manufacturer wants to know the proportion of new car buyers who pref foreign cars over…

A: A sample of 897 cars; n=897 304 preferred domestic cars; x=304 α=0.05

Q: Seventy-four percent of Americans favor spending government money to develop alternative sources of…

A: According to the provided information, Sample size (n) = 120 Probability (p) = 0.74

Q: A simple random sample of heights of 6400 Englishmen has a mean of 67.85 inches and SD 2.56 inches,…

A: Since the sample size is large so we can assume normality.Null hypothesis: H0: Australians are same…

Q: The following are the shoe sizes (inches) of 20 female students in SMU Senior High School: 6.4 7 8.1…

A: Given that  Let Xi denotes the shoes size of 20 females :  Xi:  5, 6.4, 7, 8.1, 5.8, 7.5, 9, 8.5,…

Q: One sample has n=7 and SS=35 and a second sample has n =17 and SS =45. What is the pooled variance…

A: Given information: The two sample statistics is given as, Sample 1 n1=7SS1 = 35 Sample 2 n2 = 17SS2…

Q: If the 2412 leaves are not a random sample, but the researchers treated the 2412 leaves as a random…

A: The data would most certainly be "precise, but not accurate," since the sample is large enough to…

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint, with similar designs. Since…

A: From the given information, n1 = 260 X¯1=78.2 S1 = 8.3 n2 = 245 X¯2=76.7 S2 = 7.7 α = 0.10 a) From…

Q: A telecommunications company knows that 90% of their customers own smart phones. Ten customers are…

A: Let "X" be the customers who own smartphones. The variance of the binomial distribution is given by

Q: A biased die is thrown thirty times and the number of sixes seen is eight. If the dic is thrown a…

A: Given No of trails (n)=12 Out of 30 rolls we observe 8 sixes

Q: In a survey,  55% of the voters support a particular referendum. If 40 voters are chosen at random,…

A: Given that, 55% of the voters support a particular referendum.  Sample size = 40

Q: In testing a certain kind or truck tire over rugged terrain, it is found that 40% of the trucks fail…

A: Solution: Let X be the random variable that the truck fails to complete the test run without a…

Q: Ten students took their practical exam in Science. Out of 50 items ,they obtained the following…

A: Given : scores(x):  44, 49, 42 , 25 , 29 , 21 , 39 , 40, 47 , 45

Q: 2. Throughout the state of Kansas, there are approximately 4 potholes per 100 miles of highway. If…

A: Given,The average no.of potholes per 100 miles of highway=4A random variable…

Q: Find the variance of the given population: -8, 9, 10, -10, 7, 6, 4, 3 O 7.07 O 49.98 O 57.13 O 7.56

A:

Q: Find the sample variances of the data sets A and B given below. A:3, 4, 6, 7, 10 B:-20, 5, 15, 24

A:

Q: If you have samples of n1=19 and n2=17​, in performing the​ pooled-variance t​ test, how many…

A: Given,  n1=19 and n2=17