An office manager claims that the mean time required to handle a customer complaint is less than 30 minutes. A sample of 38 complaints shows a mean of 28.7 minutes and a variance of 12 minutes. The value of the test statistic (rounded off to three decimals) is:

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Q: An independent measures research study with n=5 participants in each treatment produces sample…

A: The difference of the means is 2.

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Q: If an analysis of variance produces a value of F = 1.00, then all the samples have the same mean.…

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Q: For a study of the effectiveness of incarceration for driving while intoxicated (DWI), the following…

A: Given data: 12   8     9      15    11    3      9      7      15

Q: An independent-measures study with n= 6 in each sample produces a sample mean difference of 4 points…

A: It is given that the difference in sample means, (X1-bar – X2-bar) = 4Sample size is n1 = n2 = 6.The…

Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

A: Given sample size n1=15, sample mean x̄1=31500, s1=sample standard deviations=7900  sample size…

Q: A company of coffee prices at 4 randomly seleced grocery stores in Sampaloc, Manila showed increases…

A: Given data is12,15,17,20sample size(n)=4sample mean(x¯)=12+15+17+204sample mean(x¯)=644sample…

Q: A 30 month study is conducted to determine the difference in rates of accidents per month between…

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Q: If the number of dust particles in a square meter on a surface follows a Poisson distribution with a…

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Q: Randomly selected students in a statistics class were asked to report the number of hours they slept…

A: Let the d be the differences between number of hours slept on weeknights and weekends. Given that…

Q: In a behavioral study of gibbons, it was found that their song duration X is a random variable which…

A: The mean is 19.2 and the standard deviation is 3.6.

Q: Use an analysis of variance with α = .05 to determine whether these data indicate any significant…

A: For the given data Perform Anova single factor

Q: An independent-measures study with n = 5 in each sample produces a sample mean difference of 4…

A: We have to find test statistics.

Q: A collar manufacturer is considering the production of ew type of collar to attract young men. The…

A: We have given that,  X:- 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 f :-   4       19    30    63…

Q: A large car insurance company is conducting a study to see if male and female drivers have the same…

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Q: A recent article reported “A one-way analysis of variance found that GRE scores varied according to…

A: Note: Hi there! Thank you for posting the question. As your question has more than 3 parts, we have…

Q: If an analysis of variance is used for the following data, what would be the consequences of…

A: Given information Sample Data M1 = 10      M2 = 15 SS1 = 90    SS2 = 70 SSWithin is given by…

Q: A random sample of six advertisements taken from Scientific American had the following fog indices…

A: Ho : σ12=σ22 US   H1.σ12 ±σ22Let X be sample for scientific American following fog Indices…

Q: A survey was conducted to compare the mean cost of a meal at fast food restaurants in two different…

A: From the given information, Lets significance (α) = 0.05. Hypothesis test: Test statistics:

Q: For a study of the effectiveness of incarceration for driving while intoxicated (DWI), the following…

A: Calculate  Range , Sample Variance (S^2), Sample Standard deviation (S) from the following…

Q: The township of Middleton sets the speed limit on its roads by conducting a traffic study and…

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Q: Find quartile deviation and its co-efficient from the following data.

A: The quartile deviation is defined as Q.D = (Q3 - Q1)/2 Where Q3 = third quartile and Q1 = first…

Q: A scrap metal dealer claims that the mean of his cash sales is 'no more than R80', but an Internal…

A: μ=80, n=20, x̄=91, S2=441

Q: 1. For these two sets of data on rat liver mass, calculate the mean, the variance, and the standard…

A: Let C denote the control group S denote the artificial sweetener group The data for both the groups…

Q: A sample of 20 observations gave a standard deviation 3-72. Is this compatible with the hypothesis…

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Q: Without calculations, which of the following sets of numbers would have a larger variance?

A: Variance is a measure of dispersion. In other words, how much dispersed the data set is.

Q: When calculating an independent-samples t test, the pooled variance is:

A: Given: Independent sample t-test.

Q: The contents of a sample of 26 cans of apple juice showed a standard deviation of 0.06 ounce. We are…

A: Given,   Sample size n=26   Sample standard deviationS=0.06   Population standard deviation…

Q: A medical researcher wishes to see whether the variance of the heart rates (in beats per minute) of…

A: It is given that the variance of the heart rates of smokers is 32 and the variance of the heart…

Q: The standard error of a 16-unit sample of a variable with a mean of 20 and a variance of 64

A: Given data,Mean μ=20Variance σ2=64standard deviation =Varianceσ=64σ=8If n=16Standard error(σx)=?

Q: A If the computed value of variance and standard deviation is zero (0), this suggests that the data…

A: A) If the variance and standard deviation is zero 0  then there will be no variation in the data…

Q: The mean ±1 sd of ln [calcium intake (mg)] among 25 females, 12 to 14 years of age, below the…

A: The descriptive statistics of the two groups of females is

Q: In attempting to improve student services, a college investigates its registration process and finds…

A: If x¯1 and x¯2 are the means of two independent sample of size n1 and n2 with sample deviation s1…

Q: The following data represents the discharge of an irrigation channel during a specific time.…

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Q: We are interested in determining whether or not the variances of the sales at two music stores (A…

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Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

A: Let Population 1 be the salaries for people with doctoral degrees and Population 2 be the salaries…

Q: From a large population of tiger salamanders, Ambystoma tigrinum, a random sample of 81 were…

A: The formulas for mean, variance, and the standard deviation (for sample) is as follows:

Q: following results. Do the populations have different variances at 5% level of significance?

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Q: What test static is appropriate to use in the given problem below? “A random sample of 29 medical…

A: Conditions for t test: The sample size is less than 30 Population standard deviation is not known.…

Q: A survey was conducted to compare the mean cost of a meal at fast food restaurants in two different…

A:

Q: A survey was conducted to compare the mean cost of a meal at fast food restaurants in two different…

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Q: In a research setting, the efficiency of homecare workers (part-time and full-time) were compared.…

A: Given information: Significance level α=0.05 The variances are assumed to be homogenous. The given…

Q: The following data represent the results from an independent-measures experiment comparing three…

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: The assumption of homogeneity of variances was tested, and the Levene’s test yielded a value of (p =…

A: The hypothesis to be tested here is- H0:σ12=σ22=σ32=.....=σk2 Homogenity of varianceH1:σi2≠σj2 For…

Q: Given the data: 22, 33, 44, 55, 23, 34, 45, 56, 20, 30, 40, 50 Test the hypothesis that the…

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