Two samples of sizes 25 and 20 are independently drawn from two normal populations, where the unknown population variances are assumed to be equal. The number of degrees of freedom of the equal-variances t-test statistic is ?

Q: he university data center has two main computers. The center wants to examine whether computer 1 is…

A: GivenFor computer -1Mean(x¯1)=62standard deviation (s1)=16sample size(n1)=11For…

Q: If other factors are held constant, increasing the size of the sample increases thelikelihood of…

A: Identify the correct option.   The correct option is identified below as follows:   Test Statistic:…

Q: 10. A manufacturer is testing its new grain moisture meter and sampled out 5 grain types (A, B, C,…

A: Given information: Sample  MC A 9.6   9.8   9.7 B 12.8   12.9   12.7 C 16.8…

Q: Two independent samples of respective sizes 12 and 11, respective means 99 and 113, and respective…

A: For first sample, sample size n1 = 11, sample mean = 113, sample SD = 6 For second sample , sample…

Q: A sample of 20 elements selected from a population produced a mean of 65 and a standard deviation of…

A: State the hypotheses. That is, the means of two populations are equals. That is, the means of two…

Q: A random sample of 10 from population 1 had a variance of 3.600, while a sample of 15 from…

A: The provided information is:

Q: In a clinical trial, 20 out of 880 patients taking a prescription drug daily complained of flulike…

A: Given : n = 880 p = 0.019

Q: To test whether the variances are equal, the p-value is calculated as p=0.008 based on the test…

A: Determine the decision rule. State the hypotheses. That is, there is no difference between two…

Q: In a completely randomized experimental design, three brands of paper towels were tested for their…

A: Given:   X Y Z 92 98 83 99 95 88 87 95 90 94 96 75 Level of significance = 0.05

Q: Consider a random sample X1, X2, ....., X30 of size 30, drawn from a  normal distribution with µ=…

A: Consider a random sample X1, X2, ….., X30 of size 30, drawn from a normal distribution with mean (μ)…

Q: Consider a random sample X1, X2, ....., X30 of size 30, drawn from a normal distribution with μ=…

A: Consider a random sample X1, X2, ….., X30 of size 30, drawn from a normal distribution with mean (μ)…

Q: Consider a hypothesis test with H 0: μ = 20 vs   H 1: μ ≠ 20) at α = 0.05 on mean of a Normal…

A: The answer to the above question is:

Q: A carpenter is making doors that are 2058 millimeters tall. If the doors are too long they must be…

A: It is given that the sample mean and variance are 2,069 and 900. The hypothesized population mean is…

Q: The university data center has two main computers. The center wants to examine whether computer 1 is…

A: Given : For computer 1 x̄1 = 72.0 s1 = 19.0 n1 = 9 For computer 2…

Q: Three different methods for assembling a product were proposed by an industrial engineer. To…

A:

Q: The data from a two sample (independent-sample) research study produce a sample mean difference of 4…

A: Data is: Sample 1 n1=8 SS1=168 Sample 2 n2=6 SS2=120   The pooled variance for…

Q: In a clinical trial, 20 out of 880 patients taking a prescription drug daily complained of flulike…

A: Given : p = 0.019 n = 880

Q: The data from an independent-measures research study produce a sample mean difference of 4 points…

A:

Q: 1. If the variance is known, the sample is 800, and the level of significance is 0.01, what is the…

A: For known variance ,z for unknown variance, t

Q: Three different methods for assembling a product were proposed by an industrial engineer. To…

A:

Q: An independent consumer group published its finding that the lifetimes of electric bulbs…

A:

Q: In a dependent samples t-test__ - Equal variances are assumed automatically - An empirical test on…

A: Given:-   In a independent samples t-test - - Equal variances are assumed automatically - An…

Q: what is the general alternative hypothesis for a two tailed independent samples t test

A: Null and alternative hypotheses: The hypothesis, which is pre assumed as true, tentatively settled…

Q: If a sample is an extreme result and is significant, it will fall in the critical region which…

A: Given statement If a sample is an extreme result and is significant, it will fall in the critical…

Q: A large manufacturing company investigated the service it received from its suppliers and discovered…

A: Solution: Let X be number of deliveries were late and n be the sample number of deliveries. From the…

Q: In a clinical trial, 19 out of 878 patients taking a prescription drug daily complained of flulike…

A: Solution: Given information: n= 878 Sample size  x = 19 success  p^=xn=19878= 0.02164  Sample…

Q: What would be the minimum sample size for an independent samples t-test with a small effect size…

A: Formula for sample size:

Q: Last year the average cost of making a movie was $54.8million.This year a random sample of 15 recent…

A: Given that, Sample size n=15 Sample mean production cost x¯=62.3 Sample variance s2=90.25 Sample…

Q: A researcher randomly sampled 30 graduates of an MBA program and recorded data concerning their…

A:

Q: The data from an independent-measures research study produce a sample mean difference of 4 points…

A:

Q: To test if there is a difference in the population variances, the appropriate degrees of freedom (in…

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

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: It is been asked to find the hypotheses to test whether the variance of number of accidents per day…

Q: The impact strength of these gears measured in foot-pounds is an important characteristic. A random…

A: Claim : The mean impact strength of gears from supplier 2 is at least 25 foot-pounds higher than…

Q: I'm started doing these, but I'm not sure if they are set up right. I am confused about the…

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will…

Q: If 10 measurements of the density of a certain kind of glass had a variance of 0.0012, construct a…

A: Given: n = 10 s2 = 0.0012 Confidence level = 99% Formula used: Confidence interval = (n-1)s2χα22 ≤…

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: Given information- Population mean, μ = 1.9 Population variance, σ2 = 0.0016 Claim- the variance of…

Q: A researcher calculated sample proportions from two independent random samples. Assuming all…

A: Let p^1 be the sample proportion of 1st population and n1 be the sample size. p^2 be the sample…

Q: A business school wants to compare a new method of teaching reading to slow learners to the current…

A: Claim: Average score obtained by the new method is less than the average score obtained by the…

Q: A random sample of size n = 70 is taken from a finite population of size N = 500 with mean μ = 220…

A: It is given that the sample size is 70 and finite population size is 500. The mean value is 220 and…

Q: The records of a casualty insurance company show that, in the past, its clients have had a mean of…

A: Here we want to know the null and alternative hypothesis.

Q: A certain producer of chocolate has some problems with the variability of five suppliers of cocoa.…

A: Given information: k=5Minimum detectable effect=3.5 unitsσ2=2.5 unitsα=0.05

Q: Suppose a professor wants to know how the time spent studying affects student performance on…

A: In this question option 5 is correct (No because there are likely omitted variables in u_ that are…

Q: The university data center has two main computers. The center wants to examine whether computer 1 is…

A:

Q: A two-sample study for the difference between two population means will utilize t-test procedures…

A: Given: n1 = 23 n2 = 27 ∝ = 0.05 s1 = √18 =4.2426. s2 = √36 = 6 Part a: We have the degrees of…

Q: The competitive advantage of some small American factories such as In Tolerance Contract…

A: From the provided information, Sample size (n) = 32 Sample variance (s2) = 0.0005 Level of…

Q: The accounting department analyzes the variance of the weekly unit costs reported by two production…

A: Given data: Variances  are ; S12 = 2.3 and  S22 = 5.4 Significance level = 0.10 To calculate : the…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.