How do you find the margin of error for the difference of population means if we assume both populations have the same population variance?

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

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Q: f the correlation between x an y is .67, what percent of the variance is shared variance…

A: Let x be the independent variable Let y be the dependent variable The correlation between x and y…

Q: Comparing Means from Different Populations?

A: Given that, Comparing Means from Different Populations: There are two means from two different…

Q: In simple regression, the percentage of variance in Y that can be explained by X is identified by

A: We know that, in any regression model, we need to measure the model accuracy i.e. we need to check…

Q: Suppose a population has three values 13, 17 and 24. What is its variance?

A: Given: n=3 The mean of the data is obtained as below: Mean=∑xn=13+17+243=543=18 The mean is 18.

Q: One way to evaluate the effectiveness of a teaching assistant is to examine the scores achieved by…

A: Given Sample size, n=30 Sample variance, s2=480 Population variance, σ2=300

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: A sampling distribution of means for samples of students taking the SAT exam has a population mean…

A: It is given that the sampling distribution has a population mean 500 and standard error 200.

Q: What is an everyday example of variance within samples?

A: If we need to know the variance within samples, we need to use ANOVA Test.

Q: to population variance, we get an estimate of the sample variance by ① . This is known as ② . This…

A: Population Mean and Variance μ = 1n∑i=1nxiσ2 =1n∑i=1nxi-μ2 Sample mean and variance x¯=1N∑i=1Nxi…

Q: What is the best point estimate for the population's variance if the sample variance is 6? Round…

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Q: 2) If all of the values in a set of data were doubled, what would happen to the variance?

A: We need to use the concept of variance.

Q: In the 5 models above, which variable, by itself, explains the greatest proportion of total variance…

A: Predictor P for variable X3 is larger among all other variables. Hence variable X3 explains that…

Q: You have a dataset with a mean of 2, median of 3 and variance of 9.  What is the skewness?

A: Given that  Mean = 2 , Median = 3 , Variance = 9

Q: In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the…

A: There are 3 independent samples which are Goliath, Varmint and Weasel. We have to find the variance…

Q: Why do you think any serious researcher would use the sample mean to estimate for the population…

A: Generally research is carried out to determine a particularoutcome in the targeted…

Q: If we delete the largest observation from a sample, then the sample mean and variance will both be…

A: The mean is the average of a group of numbers, and the variance measures the average degree to which…

Q: When data is normally distributed the mean equals the mode. True

A: Normal distribution

Q: How do you find the standard error estimate of two disjoint populations, assuming they have the same…

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Q: Suppose that we have disjoint normal populations A and B and we want to find the standard error…

A: Formula to find standard error when population variances are same : SE =sp 1n1+1n2 Where , sp  is…

Q: How many degrees of freedom does the sum of squares errors have?

A: Degrees of freedom for  sum of squares errors is given by (N-k) in one way ANOVA

Q: Can you please help me calculate the expected value of x and the variance of x.

A: x p(x) x*p(x) x2*p(x) 0 0.0278 0 0 1 0.0833 0.0833 0.0833 2 0.1389 0.2778 0.5556 3 0.1944…

Q: The weight of 2 month old babies is normally distributed with a mean of 12 pounds and a variance of…

A: From the given information,  μ=12σ=9 a. The required percentage of weight more than Tina's weight…

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: 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: The best point estimator for the population mean is the sample mean. True False

A: TRUE

Q: If a difference is not statistically significant, should you conclude that the two populations are…

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Q: Why do we calculate sums of squares to find variance?

A: The sum of squares is an important term in statistics. The variance depends on the sum of squares .…

Q: When is the population standard greater than the population variance?

A: Variance: The variation between each observation from its mean is known as variance. The greater the…

Q: Suppose that we have disjoint normal populations A and B and we want to find the standard error…

A: Solution : Given data, Sample A : n1 = 11 Sample B :  n2 = 6 Confidence level  = 95% Population…

Q: Biased statistics can result from a variety of problems during the data collection process. What…

A: Introduction: It is required to identify the suitable term for the given scenario.

Q: Compute the coefficient of variation for population mean = 20 and population variance = 2

A: The population mean is 20 and the population standard deviation is 2.

Q: According to the Law of Large Numbers what effect will increasing the sample size have on the sample…

A: It is given that the sample size increases.

Q: How do you find variance with only the standard deviation and number of values?How do you find…

A: Variance is square of standard deviation. So, if you are given standard deviation, then simply…

Q: If the assumption of constant variance is violated, you can transform the response data True or…

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Q: ? Estimates of variance can be used to test a hypothesis because?

A: These estimates are formulated to interpret the means and also to discuss whether the sample means,…

Q: The variance is sometimes a negative number.

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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: How is it that estimates of variance can be used to test a hypothesis about means?

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Q: A least squares line is given by =  3 + (-2)*x. You  are told that the sample variance of x is 25…

A: Given regression equation is y=3-2x Sample variance of x is 25 Sample variance of y is 144 Here,…

Q: The foreman at a large plant estimates that there are defective parts about 1% of the time.  If the…

A: It is given that n =20,000 and p = 0.01.

Q: How are you able to get the standard variance from a TI-83 calculator?

A: Enter the given data into the list. Press the STAT button and then press ENTER. Enter the first…

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: What are two numbers with the mean of 8 and variance of 4

A: Mean=8, variance=4

Q: A pairwise comparison is a comparison of two pieces of fruit. a comparison of two means. a…

A: A pairwise comparison is a  A comparison of two means, for this we can use t-test for two…

Q: Stock Prices A random sample of stock prices per share (in dollars) is shown. Find the 80%…

A: 7.50,75.37,12.00,28.37,13.88,26.69,14.75,46.12,10.87,40.25,60.50,28.00,28.25,6.94,45.12sample…

Q: Analysis of Variance can be used to test the significant difference of an independent variable and a…

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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.…