The researchers want to determine if there is a significant difference between the academic performance of male and female in Statistics. They surveyed 6 male and 10 female with an average or mean of 89.5 and 93.6 respectively. The variances are 30.2 and 45 respectively. Is there a significant difference? Use t test for two samples to answer this problem.

Q: two classes, one with 18 students and one with 21 students, took an assesment and obtained an…

A: The overall mean is, x̄ = 55.0.The number of students in class 1 is, n1= 18.The mean score of the…

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

A:

Q: Imagine a researcher wants to determine whether parents differ from each other in their fondness for…

A: Explanation:   It is given that research asks each parent of 50 couples, It means, there are 50…

Q: The normal variance for filling a liter Coke bottle is 0.5 ounces. In a recent measurement, the…

A: The variance tell us about the spread of data about the mean, larger the variance means the data is…

Q: What is the variance of following scores: 24, 35. 22, 33, 40, 23, 20, 19, 17?

A:

Q: Please also explain why you determined whether or not the results are statistically significant.…

A: Given information isn1=40n2=40s1=0.50

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

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

Q: Construct a 90% confidence interval for the true difference between the mean amounts of time spent…

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Q: What caution is must for finding the median for ordered qualitative data?

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Q: Coach Best serve test to his volleyball class.   There were 22 students in the class.  What would be…

A: Given  N=22 Mean=12.5 Median=11 Mode=11 ∑x=274 s (standard deviation) = 2.3

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: his assignment (and the questions that follow) focuses on the "age" variable in spss, which was…

A: Given: SPSS output for the data for the variable age.

Q: The digital marketing specialist would like to test the claim that the percent of customers who use…

A: Formula : Test statistic

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: Why sample covariance and correlation is used for?

A: Co-variance and correlation measure linear relationship between the variables.   Sample co-variance:…

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: How does the sample size affect the value of the mean and the standard deviation? Please elaborate.

A: Mean : The mean is the data's Centre point or typical value and summarizes a complete dataset with a…

Q: Create two scenarios when you would use an independent samples t-test. Make sure to clearly…

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Q: The daily rates of a sample of eight employee at POL Corp. are $550, $420, $560, $500, $700, $670,…

A:

Q: A sample of n = 26 scores has SS = 125. What is the variance for this sample ?

A: According to the given information, we have SS = 125 n = 26

Q: What statistical calculation, which results in the same units as the measured data, represents the…

A: Introduction: For a random variable X taking n sample values, the sample variance is given by the…

Q: Why is the median less affected by skewed data than the mean?

A: Mean: The average values of the total observations. Median: The value that divided data set into two…

Q: Click on the Data button below to display the data. Copy the data into a statistical software…

A: Given data, Guernsey Jersey Holstein 4.59 5.03 3.22 5.2 6.55 3.67 5.61…

Q: A value of r2=.09 is considered what for the effect size test of the percentage of variance…

A: Given, r2=0.09

Q: The time married men with children spend on child care averages  6.9 hours per week. You belong to a…

A: From the provided information,The time married men with children spend on child care averages  6.9…

Q: Two samples from two different populations are given: (а) Sample 1: 19.8, 12.5, 13.2, 16.9, 18.3,…

A: Let σ12 be the variance of population 1 and σ22 be the variance of population 2. Hypothesis: Null…

Q: Why are t statistics more variable than z -scores?

A: t-statistics uses sample variance instead of population variance.   t statistics has both s and x̅.

Q: Listed below are the systolic blood pressures (in mm Hg) for a sample of six men aged 20-29 and for…

A: Data given Men aged 20-29: 116,125,132,118,131,123  Mean aged : 128,151,140,125,164,139

Q: The correlation between mean 2015 Mathematics SAT scores and mean 2015 Writing SAT scores for all 50…

A: Given information: For all 50 states and the District of Columbia, the correlation between the mean…

Q: What procedure is used to test whether two interval or ratio variables are related or not? A.…

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Q: the grouped data?

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Q: what is the  z score of 128,101,116,119,131 when the mean is 119 and variance is 36

A: It is given that  Mean, μ = 119 Variance, σ2 = 36 Standard deviation, σ = 6 Z-Score, Z = ( X - μ )/σ

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: Explain how to calculate and interpret the p-value for a mean and a proportion, for both a one- and…

A: P-value is the probability of obtaining the value of the test statistic or a value even more…