WGU Statistics Test questions and answers verified and updated.

WGU Statistics Test questions and answers verified and updated. In a standard 52-card deck, where each card is assigned a numeric value, the mean of the 52 cards is 7.0 with a standard deviation of 3.742. To test if a representative sample can be attained, the deck is shuffled and 13 cards are randomly drawn, one at a time. Each card is recorded and then returned randomly to the deck before the next card is drawn. This process of drawing 13 random cards is repeated a total of 20 times, and the mean and standard deviation of each round is computed. Which type of sampling is this an example of? Randomization Multiple comparison Matched pairs Bootstrap - correcy answers.Bootstrap A study is done to determine if the color of an apple affects the purchase rate by consumers at a grocery store. Purchase counts for three colors of apples are collected. Which technique should be used to determine if there is a difference in purchase rate by color? Rank-based Randomization t-test ANOVA - correcy answers.ANOVA A hospital network collects the amount of time it takes doctors to see patients. Which two techniques are appropriate to compare the mean times of two subsets within this set of doctors? Choose 2 answers ANOVA t-test Logistic regression Principal component analysis - correcy answers.ANOVA t-test A data analyst needs to determine whether antioxidants in blackberries can reduce age-related cognitive decline. Twenty-five adults between 65 and 80 are selected to eat blackberries for six months and be retested. The original scores are compared with the second scores to determine whether there was decline. What is the appropriate model to test the hypothesis? z test ANOVA Linear regression Two-sample t-test - correcy answers.Two-sample t-test Which assumption does a data analyst have to make when performing ANOVA on a dataset? There are just two parameters that are being estimated. The error terms follow a normal probability distribution. The parameters are additive. The explanatory variable is continuous. - correcy answers.The error terms follow a normal probability distribution. Which two assumptions are made when the linear regression model is used? Choose 2 answers Critical value is based on Fisher's exact test. Error terms are independent and identically distributed. Variances are not equal. Parameters β 0, β 1, and σ 2 are constant. - correcy answers.Error terms are independent and identically distributed. Parameters β 0, β 1, and σ 2 are constant. Which assumption is required to perform a two-sample t-test? Equal variance Large sample size Small sum of residuals Equal mean - correcy answers.Equal variance Given the following statistical model: y = 42 - 4.6 b Match each element of the model with its corresponding term. Answer options may be used more than once or not at all. Select your answers from the pull-down list. y Dependent variable Dependent variable 42 Intercept Intercept -4.6 Slope Slope b Independent variable Independent variable - correcy answers.y Dependent variable Dependent variable 42 Intercept Intercept -4.6 Slope Slope b Independent variable Independent variable Given the following generalized two-sample t-test equation: yi ,j = µi + εi ,j Classify each element in the equation. Answer options may be used more than once or not at all. Select your answers from the pull-down list. - correcy ,j Observed value Observed value µi Mean response Mean response εi ,j Error term Error term Given the following linear model: y i = β 0 + β 1 xi + ε i Classify each element correctly. Answer options may be used more than once or not at all. Select your answer from the pull-down list. - correcy answers.y i Response variable Response variable β 0 + β 1 xi Mean response Mean response xi Explanatory variable Explanatory variable A study comparing graduating cumulative GPAs from students with two different majors is conducted to study the effect of each major on academic achievement. From the list of all graduating students in both majors, a random sample of 30 students from Major