Questions asked
Jon Southam
Numerade educator
Correlations Weightlb Heightin HoursofTVper week Weightlb Pearson Correlation 1 .315 .424* Sig. (2-tailed) .090 .019 N 30 30 30 Heightin Pearson Correlation .315 1 -.146 Sig. (2-tailed) .090 .441 N 30 30 30 HoursofTVperweek Pearson Correlation .424* -.146 1 Sig. (2-tailed) .019 .441 N 30 30 30 *. Correlation is significant at the 0.05 level (2-tailed).
Correlations *. Correlation is significant at the 0.05 level (2-tailed).
A Margin Means of B B Margin Means of A 1 2 \begin{tabular}{|c|c|} \hline 1 & 2 \\ \hline 5 & 7 \\ \hline 3 & 11 \\ \hline 4 & 9 \\ \hline \end{tabular} 6 7 6.5 B A 2 Margin Means of \( B \) Margin Means of A
Anna D.
What is the probability of obtaining a random sample of size 16 with a sample mean of 73 or higher? μ=70, σ=2.5
Aparna Shakti
Write the regression equation x: 29 42 15 10 14 13 10 13 4 13 20 8 11 12 17 10 6 3 12 10 14 27 13 13 12 9 8 18 7 15 y: 112 88 107 63 63 69 86 95 54 79 109 97 82 103 126 92 84 87 102 78 80 120 103 95 89 73 97 89 63 111
Bradley Duda
Compute (by hand) the Pearson-correlation coefficient between the “Height” and “Weight” variables Height: 61, 60, 51, 59, 59 Weight: 54, 79, 109, 97, 82
Lucas Finney
2. A survey was taken to see if there is a relationship between political affiliation and attitudes toward a bond issue that will be on an upcoming ballot. The following results were obtained: Response to Bond Issue Approve Disapprove Undecided Affiliation Democrat 90 20 30 Republican 20 80 20 Independent 20 5 15 Conduct a hypothesis test at the .05 level of significance. (H0): There is no relationship between political affiliation and attitudes toward a bond issue.Null: There are not a relationships between political affiliation an attitudes towards a bond issue. (H1): There is a relationships between political affiliation an attitudes towards a bond issue. Chi-Square test statistic formula: X^2 = ? [ (O-E)^2 / E ] where: O = observed frequency E = expected frequency The expected frequency is calculated as: E = (row total x column total) / grand total
Danielle Fairburn
For what sample mean value is there a probability of 10% of obtaining a random sample of size 16 with that sample mean or higher? μ= 70 σ = 10
For what sample mean value is there a probability of 10% of obtaining a random sample of size 16 with that sample mean or higher? μ= 70 standard deviation OF SAMPLING DISTRIBUTION: 2.5
Tim Thornhill
1. A researcher is again interested in the height, weight, and TV-watching habits of 10 year old children. Suppose that the weights of al 10 year olds in the United States are normally distributed with ?= 70 and ? = 10. The researcher randomly selects a sample of size 16 from this population of 10 year olds. Use this information to answer questions A-C (3 points): a. Define the sampling distribution of the mean in terms of its: a) Mean b) standard deviation c) shape b. What is the probability of obtaining a random sample of size 16 with a sample mean of 73 or higher? c. For what sample mean value is there a probability of 10% of obtaining a random sample of size 16 with that sample mean or higher?