A study aims to compare the social media usage rates of men and women.  Nine men and 9 women are drawn from the general population and the average time (in minutes) they spent on social media each day was compared (men’s mean = 40, sum of squares = 153; women’s mean = 48, sum of squares = 216).  What is the (a) estimated population variance for each random sample, and (b) pooled variance?       Estimated population variances = 19.13 and 27.00; Pooled variance = 23.07       Estimated population variances = 19.13 and 27.00; Pooled variance = 20.50       Estimated population variances = 17.00 and 24.00; Pooled variance = 20.50       Estimated population variances = 17.00 and 24.00; Pooled variance = 23.07

Q: Does the sample median tend to target the population variance

A: If the original distribution is normal, the sample mean will also be normal, with variance , where n…

Q: How would you explain the analysis of variance, assuming that your audience has not had a statistics…

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Q: Where are most of the data gathered in a negatively skewed distribution? Which value is larger, the…

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Q: A college placement office sent a questionnaire to a sample of business school graduates requesting…

A: We know that variance is a measure of how distorted a data set is. It is calculated by the average…

Q: Describe some of the reasons that group means might be different from each other in an analysis of…

A: What is ANOVA? Watch the video for an introduction, or read on below: An ANOVA test is a way to…

Q: Could two samples have the same range but different means? Explain.

A: Yes, Two samples have the same range but different means.

Q: Here are 6 celebrities with some of the highest net worths​ (in millions of​ dollars) in a recent​…

A: The number of observations is n = 6.

Q: (a) State the null hypothesis H and the alternative hypothesis H₁. Ho :O H₁ :0 (b) Determine the…

A: Followings are the Explanation of the question Use the two sample Z test    Sample Mean X1=…

Q: Suppose when a data set with 32 values is treated as a "population", the value of the (population)…

A: Given that  Population Variance = 145.2  n = 32

Q: What is the drawback of summarizing the data using the median

A: Median: Median is the middle value of the set of numbers. The set of numbers should be arranged in…

Q: Explain what the purpose of an Analysis of Variance is.

A: A ANOVA is a statistical method for making simultaneous comparisons between two or more group means.…

Q: A researcher wants to test the difference in the mean scores of two independent groups on a…

A: To determine if there is a significant difference in the mean scores of the two groups, the…

Q: Explain the Formulas for a sample comparable to the ones for a population?

A: If the data includes all the possible values, then it is called population. Whereas, the sample data…

Q: An adventure company runs two obstacle courses, Fundash and Coolsprint. The designer of the courses…

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Q: Explain the role of places in the series of experiments. Construct the layout and perform the…

A: Design of Experiment :  Every researcher wants that his experiment need not to be invalid or…

Q: State the null and alternative hypothesis as an expression

A: Given that x1=12.5 x2=13.9 s1=3.9 s2=5.2 n1=14 n2=17

Q: the variance of a data set is 144 and mean is 72 then coefficient of variance is

A: Given,variance(σ2)=144mean(x¯)=72

Q: A school is sending 15 children to a camp. If 30% of the children in the school are first graders,…

A: The question is about binomial distribution Given : Randomly selected no. of children ( n ) = 15…

Q: Explain the three major sources of error variance related to reliability. Provide an example of a…

A: Reliability refers to the consistency in test outcomes of a measure under similar conditions.

Q: Give 2 examples of Mean in Measure of central tendency to ungrouped data

A: Introduction: It is required to provide two examples of calculating the mean of ungrouped data.

Q: What is variance?

A: Variance is a measure of dispersion or spread of a data distribution. Variance of a data…

Q: According to a report published by the USDA 4 years ago, a typical American consumes an average of…

A:

Q: In a sample of 81 elements, the mean was 60 and the variance was 144. What is the standard error for…

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Q: What is the equation for The standard deviation of the distribution of sample proportions

A: Let p be the population proportion of successes.

Q: What is the variance of the data set 14,23,9,12,21,18,8

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Q: How do you calculate the variance of a set of numbers?

A: Variance is a measure of how spread out a set of numbers is. To calculate the variance: Find the…

Q: State one possible advantage of using paired samples instead of independent samples.

A: Provide the possible advantage of using paired samples instead of using independent…

Q: Describe why a researcher would use ANOVA. and Design a research idea that would require ANOVA to…

A: The one-way variance analysis (ANOVA) is used to evaluate if the mean of three or more independent…

Q: hat is a percentile and how do we plot them on box and whisker plots?

A: Percentile is the value in statistics which divides the population in two groups. The certain…

Q: Professor Hayashi has implemented a new book for his Fall 2013 statistics course. He wants to see if…

A: The formula for calculating the Measure effect size using Cohen's D is, Here, M = sample mean s…

Q: Give 2 examples of Median in Measure of central tendency to ungrouped data

A: Median: Median is the middle most value of a set of observations.

Q: What is the variance of the data set 14,23,9,12,18,8

A: Given Data :  XX 14 23 9 12 18 8 Below table will be used to calculate variance :…

Q: A health professional is whether stress level before a routine practice session can be used to…

A: Given : A health professional is whether stress level before a routine practice session can be used…

Q: Consider a data set with a very high sample variance measurement. What would you expect the impact…

A: Let a data set have a high sample variance. The histogram is used to visualize a grouped frequency…

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: measure of variability?

A: We know that  Mean and Median is used to measure of Central tendency of the given sample data .…