BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

Solutions

Chapter
Section
BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

Weinstein, McDermott, and Roediger (2010) report that students who were given questions to be answered while studying new material had better scores when tested on the material compared to students who were simply given an opportunity to reread the material. In a similar study, a group of students from a large psychology class were given questions to be answered while studying for the final exam. The overall average for the exam was μ = 73.4 but the n = 16 students who answered questions had a mean of M = 78.3 with a standard deviation s = 8.4. Use a two-tailed test with α = .01 to determine whether answering ques­tions while studying produced significantly higher exam scores.

To determine

To Find: Whether answering questions while studying produced significantly higher scores using a one-tailed test with α=0.01 and n=16

Explanation

Given info:

A sample of 16 students is selected from a population with mean 73.4. The sample mean, and standard deviation (s) is found to be 78.3 and 8.4 respectively. One-tailed hypothesis test using α=0.01 is to be performed.

Calculations:

Step 1: Null Hypothesis is H0:μ73.4 and Alternate Hypothesis is H1:μ>73.4

Step 2: For a sample of n=16 , the t-statistics will have (n1) degrees of freedom, i.e. df=15 . For a one-tailed test with α=0.01 and df=15 , the critical value (CV)  is obtained from the t-table as t=2.602

Step 3: t-statistics can be calculated using formula:

t=Mμsm

Calculate sm using the formula:

sm=sn=8.416=8

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Math Solutions

Find more solutions based on key concepts

Show solutions add

Simplify the expressions in Exercises 97106. x1/2y2x1/2y

Finite Mathematics and Applied Calculus (MindTap Course List)

SPENDING on Equipment and Software As the United States continues to recover slowly from the Great Recession, s...

Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach

Finding a Limit In Exercises 536, find the limit. limx3(2x2+4x+1)

Calculus: Early Transcendental Functions (MindTap Course List)

Prove each identity. seccos=tansin

Trigonometry (MindTap Course List)

The average value of f(x) = 3x2 + 1 on the interval [2, 4] is: a) 29 b) 66 c) 58 d) 36

Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th