(d) Test whether the population variance is 20 cm^2.

Q: A sample (X1, X2,..., X70) of size 70 was drawn from a population X. The mean of X is 30 and its…

A: According to the central limit theorem, when a sample a sufficiently large sample (size >= 30) is…

Q: There are four numbers in a data set. They are 3, 4, 10, and 11. a) What is the ∑∑ x2x2    b) What…

A: Number of samples (n) = 4 X X2 3 9 4 16 10 100 11 121

Q: Why does z-test is being used when the sample size is large(> 30) and t-test when the sample size is…

A:

Q: Wallace asked 30 participants to report on their political affiliation by marking "1" for liberal,…

A: Given that 30 participants  For liberal 1  For conservative 2  For not interested in poltics at all…

Q: How can we know that the sample size of A is less than B? The sample size of both is not stated in…

A: Here we have to explain How can we know that the sample size of A is less than B

Q: Most grad schools require 1000 on GRE.  It's a composite score, with two parts (like SAT). Each part…

A:

Q: For data that is not normally distributed we can't use z-scores. However, there is an equation that…

A: a. Required percentage will be given by as follows using chebychev's inequality:…

Q: An analysis of variance produces SSbetween=30,SSwithin= 60, and an F-ratio with df= 2,15.. For this…

A: It is given that, SSbetween is 30 and SSwithin is 60.

Q: ir there is claim that the variance of sales is defferent from 39. A sample of 29 is chosen, the…

A:

Q: c) A student is working on his science fair project. He hypothesizes that the average height of a…

A: For the distribution of the height of plants, it is hypothesized that the average height is 10 cm,…

Q: We would like to compare samples from two different populations A and B. The means of these two…

A: Given that, MuA= 200 MuB= 200 Var(A) = 72 Var(B) = 200 Sample size, nA = 36  nb= 100 We've to find…

Q: Two popular brands of tires for tractor-trailers are the Puma and the Eternal. Rita is a buyer for a…

A: Step 1: The data of two independent samples is given as Group-1: Puma tiresGroup-2: Eternal…

Q: There are four numbers in a data set. They are 4, 6, 8, and 11. c) The formula for the sample…

A: Number of samples (n) = 4

Q: Let's say we collect a sample of 500 individuals from a community in Reno and find that 20 of them…

A: Test statistic formula for testing one sample proportion is, z=p^-pp1-pn  =p^-pSEp In the given…

Q: What price do farmers get for their watermelon crops? In the third week of July, a random sample of…

A: Obtain the 90% confidence interval for the population mean price that farmers in this region get for…

Q: Sum of all elements (observations) of a sample is 188.6, and the mean of the sample is 21.7. What is…

A:

Q: Suppose that you draw a random sample from a population where you know the population mean is 36 and…

A:

Q: You receive a brochure from a large university. The brochure indicates that the mean class size for…

A: The question is based on a hypo. testing of a popl. mean Given data : Sample size ( n ) = 18 Level…

Q: In a random sample of males, it was found that 29 write with their left hands and 225 do not. In a…

A:

Q: What is the margin of error for a 99% CI for a mean, when the sample size is 12, the sample average…

A: Given: Sample size, n = 12 Sample mean, x = 52 Sample standard deviation, s = 13 It follows a…

Q: An analysis of variances produces dfnetween= 3 and dfwithin = 24. If each treatment has the same…

A: Given that,dfbetween = 3dfwithin = 24Each treatment has the same number of participants.

Q: fou randomly sample 100 FIU students and collect data on the number of coffee drinks consumed per…

A: Given that, Random sample of 100 FIU students and data on the number of coffee drinks consumed per…

Q: Jessica hypothesizes that giraffes will look longer at human infants than at adults. In her zoo, she…

A: It is given that Jessica hypothesizes that giraffes will look longer at human infants than at adults…

Q: a(n). . . test ...... To test the equality of two variances, you would use Chi-square

A: We will F test to test the equality of two variances.

Q: Suppose you are constructing a Cl for a mean using the T-distribution and your sample size is 17.…

A: Degrees of freedom = n-1

Q: The sampling variability of the sample means becomes smaller as the sample size n gets larger. True…

A: Here we need to determine whether the given statement is true or false.

Q: A researcher calculates the variance of her sample to be s = -6. , what would you tell the…

A: Here's the explanation for this as follows; The sample variance, s², is used to calculate how varied…

Q: Which should be true if we use a large sample rather than a small one?

A: Here given , collect a representative random sample  Here Sample size  is  large Here use central…

Q: Answer: 33. A fashion designer wants to know how many new dresses women buy each year. Assume a…

A:

Q: (1)In 2015, the average duration of long-distance telephone calls from a certain town was 3.9…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: rationale for using n – 1 to compute the sample variance

A: we divide by 'n' to get the population variance.

Q: For a sample of 9 with a mean of 5994. How would i find the EX?

A:

Q: i need Solution with using 50 values of data Data: 25 2 7 1 21 7 21 27 27 8 21 28 4 26 23 10 17 20…

A: data :…

Q: he margin of error for a 90% CI for a mean, when the sample size is 12, the sample average is 52,…

A: As the population standard deviation is known, we will use t distribution. Degrees of freedom =…

Q: Describe research situation to illustrate the use of the One-way Analysis of Variance and one…

A: We know that, Assumptions of One-way analysis of variance (ANOVA) : 1] Samples are randomly…

Q: Poplar Weights (kg) and Bonferroni Results No Treatment 1.212 0.569 0.557 0.126 1.301 (1) TREATMENT…

A: Solution: The given data is

Q: What is the margin of error for a 95% CI for a mean, when the sample size is 8, the sample average…

A: given data sample size (n) = 8sample mean ( x¯ ) = 152sample standard deviation (s) =3095% ci for…

Q: In each of the following settings, decide whether you should use two-sample t procedures to perform…

A: Two sample t-procedures are used to compare two population parameters with independent population,…

Q: 5.70 A company purchases large lots of a certain kind of electronic device. A method is used that…

A: * SOLUTION :-

Q: For a sample of n=16 scores, how many scores are used to calculate the sample variance?

A:

Q: For the population with a mean of 50 and a standard devitation of 8, find the z-score and standard…

A: Let X denotes the random variable that measures the particular characteristic of interest. Let, X1,…