If the 97% confidence interval for the difference u 2 of the means is (-27.678, -20.522), what is the value of the pooled variance estimator? (You may assume equal population variances.) Pooled Variance Estimator = 1.6488

Q: The “Winkles” quiz team has a winning rate of 72%. The team is planning to participate in 8 quizzes…

A: The “Winkles” quiz team has a winning rate of 72%. The team is planning to participate in 8 quizzes…

Q: Why is the standard deviation used more frequently than the variance as a measure of variability?

A: The standard deviation and variance, are measures of dispersion (variability).  The relation between…

Q: Which of the following is a good point estimator for the population variance?

A: The objective of the question is to identify a good point estimator for the population variance in…

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

A: We know that- The value of F is the ratio of two mean squares. When the value of F = 1, then there…

Q: What is the smallest sample size required to provide a 95% confidence interval for a mean, if the…

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Q: If the Mean of a data set is 700 and the Variance is 49; Calculate the intervals used for the…

A: Given information, Mean of a data set = 700 Variance = 49 We have to calculate intervals using…

Q: Presented are the ozone concentrations in areas of Philippines, Japan, Taiwan, and Singapore. Obtain…

A: Given  the ozone concentrations in areas of Philippines, Japan, Taiwan, and Singapore.

Q: Professor Smith took a sample of 210 students from her morning class and a sample of 163 students…

A: We have to find combined mean(average), combined median and combined standard deviation in this…

Q: The researchers want to determine if there is a significant difference between the academic…

A: Given that  For Male  Sample size (n1)=6 Sample Mean (x̄1)=89.5 Sample variance (s12)=30.2 For…

Q: If the variance of a national accounting examination is 828, how large a sample is needed to…

A: Given data: Variance  = 828 Margin of error = 4 points Confidence level = 99 % To calculate the…

Q: What formula is used to calculate the sample variance?

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Q: A researcher has collected the following sample data: 3, 5, 12, 3, 2. The mean of the sample is 5.…

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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: variance of the data 2,4,5,6,8,17 is 23.33 ,(2 :then variance of 4,8,10,12,16,34 will be

A: Result: If the variance of a data set a1,a2,...,an is σ12 then the variance of data set…

Q: What is the variance and standard deviation of this data

A: Given that We have to find Variance and standard deviation :

Q: Should be consider this score unusual? What is the value of the test statistic?

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Q: What are the steps for a hypothesis test for population mean when the variance is known?

A: Given the variance for hypothesis test for population , To write the steps for the hypothesis test…

Q: what test is used to determine whether two population means are different when the variance are…

A: The test that is used to determine if the two population means are different when the population…

Q: A random sample of 17 snowmobiles was selected, and the lifetime of the battery was measured. The…

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Q: what test is used to determine whether two population means are different when the variance are…

A: Solution :  when the variance are known and sample size is large then we use z test to determine…

Q: What is the best point estimate for the population's variance if the sample variance is 41?

A: Given,sample variance(s2)=41

Q: In a certain population, the mean price of the stock prices was 230, the median was 255, the…

A: Given data Mean price = 230 Median = 255 Variance = 1225 Q1 = 240 Q3 = 270 Second quartile is median…

Q: What is the standard deviation of a sample of 120 observations, if the variance of the sample 2.56?

A: It is given that the variance of the sample is 2.56.

Q: We have to compare the result of all variables using range,interquatile range,variance and standard…

A: As asked, for the given data we have to compare the result of all variables using the range,…

Q: The best way to reduce the variances in the distributions of means when conducting a t test for…

A: The sample size would be in the denominator of the formula for variance of distribution of means.…

Q: Give one method to increase statistical power and Which test statistic should you use if you are…

A: Given problem Given that   Method to increase the statistical power : a) Increase the sample size…

Q: You would like to estimate the variance of sick days at a Fortune 500 company.  You randomly select…

A: Given sample size n = 15degree of freedom = n - 1 = 15 -1 = 14sample standard deviation = 1.2sample…

Q: Below are the jersey numbers of 11 players randomly selected from a football team. Find the range,…

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Q: A SAMPLE SIZE OF 36 WAS DRAWN AND ITS MEAN WAS FOUND TO BE 80. TEST WHETHER THIS SAMPLE COULD HAVE…

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Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

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Q: The F-statistic is a ratio score resulting in a measure of the estimated proportion of variance due…

A: The F-statistic is a ratio score resulting in a measure of the estimated proportion of variance due…

Q: the homogeneity of variances assumption states that the variance in the two samples must be equal?…

A: Homogeneity of variances always make about the population variance not about sample.

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.