Answered: Observation Observations Time 10.85…

Understanding Business

12th Edition

ISBN:9781259929434

Author:William Nickels

Publisher:William Nickels

Chapter1: Taking Risks And Making Profits Within The Dynamic Business Environment

Section: Chapter Questions

Problem 1CE

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Question

Excel Assignment
Samsung manufactures cellphone with an average standby time of 10 hours between charges. The
standby time of the cellphone is normally distributed. During the design stage, the quality engineering
staff recorded 18 observations of the standby time of the cellphone. Using the observations below, is
there evidence that the average standby time of a Samsung cellphones is not 10 hours? Use a level of
significance of .05

Answer the following question:
1. What is the null and alternative hypothesis to the case above?
2. Copy the data into excel and do an analysis to test the hypothesis
Upload the excel file with the your assignment submission

3. What is the conclusion of your analysis? (try to state it in terms of the original problem or
question)
4. Develop the 95% confidence interval.

Observation
Observations
Time
10.85
1234
11.4
10.81
10.24
5
10.23
67
9.49
9.89
8
10.11
9
10.57
10
11.21
11
10.1
12
11.22
13
10.31
14
11.24
15
9.51
16
10.52
17
9.92
18
8.33

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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