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BSNS 112 FINAL EXAM ALL 400 ACTUAL EXAM
QUESTIONS AND CORRECT DETAILED ANSWERS
ALREADY GRADED A+
Which of the following would not assist you in checking to see if a sample could have come from a normal distribution?(a) Looking at the shape of a histogram.(b) Calculating the skewness coefficient.(c) Calculating the coefficient of variation.(d) Looking at box and whiskers plots.(e) Calculating the kurtosis coefficient.(c) Calculating the coefficient of variation.A 95% confidence interval is an interval calculated from ________ data and will cover the true ________ in 95% of all samples of the same size randomly drawn from the same population (e) sample; population parameter
As the term has been used in lectures, the term standard error can refer to:
(a) The standard deviation of the population mean.(b) The standard deviation of the sample proportion.(c) The standard deviation of the population proportion.(d) The standard deviation of the difference in population means.(e) All of the above.(b) The standard deviation of the sample proportion.How are the degrees of freedom for this test calculated?(a) One less than the number of categories. 1 / 4
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2 (b) (The row total x the column total)/total sample size.(c) (The number of rows -1) x (the number of columns -1) (d) (Observed frequency -Expected frequency)2/Expected frequency.(e) The number of columns.(a) One less than the number of categories.Which of the following three statements about p-values is not correct?(b) The p-value can be interpreted as the probability of making a Type I Error in repeated sampling.If we wish to examine the relationship between total weekly household food spending and market spending for market visitors we should use what type of graph/chart?(a) A clustered bar chart (b) An xy scatter plot (c) A box plot (d) A cross tabulation table (e) A stacked bar chart (b) An xy scatter plot You have been asked to test the claim that the proportion of visitors to the market that are not regular buyers of organic produce exceeds the proportion of regular organic produce buyers. Which of the following tests would be the most appropriate in this case?(a) A hypothesis test for the difference in two proportions (Ha: Pnon organic - Porganic > 0).
(b) A hypothesis test for one proportion (Ha: Pnon organic > 0.5).
(c) A chi square test of independence (Ha: Organic purchasing is independent of regular visiting).(d) A chi square goodness of fit test (Ha: Pnon organic > 0.5, Porganic < 0.5).(b) A hypothesis test for one proportion (Ha: Pnon organic > 0.5). 2 / 4
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3 Which one of the following tests would be the most appropriate to see if there is a relationship between market visitors' annual incomes and their market spending?(a) A chi-square test of independence.(b) An ANOVA test.(c) Correlation analysis.(d) An independent samples t-test for the difference in means.(e) A dependent samples t-test for the difference in means.(c) Correlation analysis.When is ANOVA test best used for?comparing means between two independent groups when can an independent sample t test be best used for?Comparing means between two independent groups When can a dependent samples t test be best used for?compare means of two related groups When is a Chi-square test best used for?to determine if association between two categorical variables Which of the following statements is/are true when comparing the Wilcoxon Rank Sum test to the more commonly used parametric methods for testing differences in means?(a) An advantage of the Wilcoxon Rank Sum test is that the null can be rejected due to differences in the distribution other than just differences in the mean.(b) An advantage of the Wilcoxon Rank Sum test is that it requires no distributional assumptions.(c) A disadvantage of the Wilcoxon Rank Sum test is that there is generally a higher chance of 3 / 4
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4 rejecting the null hypothesis when the null is in fact not true.(d) An advantage of the Wilcoxon Rank Sum test is that it usually has a higher power.(b) An advantage of the Wilcoxon Rank Sum test is that it requires no distributional assumptions.Recall that in the ANOVA F-test, a numeric variable is measured across three or more populations, and the test statistic can be interpreted as the ratio of "variance explained by differences in group means" to "within-group variation." All else equal, which of the following would unambiguously decrease the p-value?(a) An increase in the sample mean for one treatment group whose mean was previously above the combined sample mean (i.e., the "grand mean").(b) An increase in the sample mean for one treatment group whose mean was previously below the combined sample mean (i.e., the "grand mean").(c) An increase in the within group variance for one of the treatment groups whose variance was previously above the combined sample variance (i.e., the "grand variance").(a) An increase in the sample mean for one treatment group whose mean was previously above the combined sample mean (i.e., the "grand mean").Given a continuous random variable x, what is Pr(x = 0.5)?(a) 0.00 (b) 0.25 (c) 0.50 (d) 1.00 (e) More information is needed to answer this question.(a) 0.00 What is the greatest concern about the regression below?(a) It has a small slope coefficient.
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