Statistics Questions

Jul 20th, 2016
Studypool Tutor
University of Phoenix
Price: $15 USD

Tutor description

True or False. Justify for full credit. (a) If P(A) = 0.4, P(B) = 0.5, and A and B are independent, then P(A AND B) = 0.9. (b) If the variance of a data set is 0, then all the observations in this data set must be zero. (c) The mean is always equal to the median for a normal distribution. (d) A 95% confidence interval is wider than a 90% confidence interval of the same parameter. (e) In a two-tailed test, the value of the test statistic is 2. The test statistic follows a distribution with the distribution curve shown below. If we know the shaded area is 0.03, then we have sufficient evidence to reject the null hypothesis at 0.05 level of significance.

Word Count: 576
Showing Page: 1/3
1. Qa.b.c.d.False: P[AunionB] = P(A) * P(B) = 0.4 * 0.5 = 0.2 != 90%.False; variance is zero and data values are non-zero.TrueTrue: A normal distribution with a mean u and variance sigma-squared has a confidenceinterval (95%) of (x +/- 1.96 sigma/sqrt(n)). For a 90% confidence interval: (x +/- 1.64sigma/sqrt(n)). The interval is below the confidence limit.e. True. The shaded area is the p-value (probability), and p<0.05. Therefore, we mustreject H0.2. Qa. Parameter: The stated percentage of Republicans is considered to be a sample of alarger population, and therefore the value is calculated as a characteristic of apopulation.b. Ordinal: The nature of the question depends upon rankings, and therefore is ordinal.c. Cluster: The total population is divided into homogenous subgroups (clusters), and arandom sample was drawn from these clusters.3. Qa. ANOVA. The test call

Review from student

Studypool Student
" Thanks for the help. "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1827 tutors are online

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors