Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product. Because of a minor unadvertised change in the product, there is concern that the satisfaction may have changed. Suppose the satisfaction rating from a sample of 60 customers have a mean of 5.60 and a standard deviation of .87. Do these data indicate that the mean satisfaction rating is different from 5.9? Test with a = .05. What is the p-value for the test?

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See the attached file. Thanks

Over a period of years, toothpaste has received a mean rating of 5.9, on a 7-point scale, for overall customer satisfaction with the product. Because of a minor unadvertised change in the product, there is concern that the satisfaction may have changed. Suppose the satisfaction rating from a sample of 60 customers have a mean of 5.60 and a standard deviation of .87. Do these data indicate that the mean satisfaction rating is different ...

Solution Summary

Shows how to calculate the p-value for a one sample mean test.

I. Which measure of central tendency would you use to summarize the data below?
11.2, 13.9, 15.8, 16.6, 28.2, 12.1, 17.3
a. Arithmetic mean
b. Mode
c. Median
d. Weighted mean
II. Use the following scenario presented below to answer questions 1 to 2: January rainfall (mm) was recorded at four weather stations a

1. Why do you use N-1 rather than just N when calculating the standard deviation as estimated from a sample? How does the t-statistic differ from the z-statistic? When would you use a single-sample t-test?
2. What is an independent-sampletest? How does it differ from a single-sample t-test and a paired-sampletest?Why do yo

Try out some of your own ideas for analyzing
this data. Use one of the following techniques:
regression line and equation; correlation
one-sample t-testone-sample t confidence interval
matched-pairs t-test
two-sample t-test
two-sample t confidence interval
F-testfor variances
ANOVA
one-sample z testfor proportions

A sample of 40 observations is selected from one approximately normal population. The samplemean is 102 and the sample standard deviation is 5. A sample of 50 observations is selected from a second source. The samplemean is 99 and the standard deviation is 6. Conduct a hypothesis test using the .04 level of significance to

Using the data attached, perform the following:
Imagine that you have population data with an average height of 5 feet 10 inches. Conduct a one-sample t-test to determine whether your sample population is significantly different from the general population.
Imagine that you have population data with an average satisfaction

Compute a one-sample t-test comparing the age of your invented sample to the age of the general population of college students in traditional on-ground universities. Assume the population mean is 21. Any other required data may be fabricated. Please include a paragraph of interpretation of the results.

A random sample is obtained from a population with a variance = 625, and the sample mean is computed. Test the null hypothesis Ho: u = 100 versus the alternative hypothesis H1: u > 100 with alpha = 0.05. Compute the critical value xc and state your decision rule for the following options: 1) n=25 2) n=16 3) n=44 4) n=32

I have studied 3 similar methods fortesting hypotheses about population means -- a 1-sampletest, and 2 versions of a 2-sampletest (independent samples, and dependent samples).
What are the key conceptual differences between these 3 methods? In other words, under what conditions do we choose each method for our analysis,

Assume that you want to test the claim that the paired sample data come from a population for which the mean difference is ยต d = 0. Compute the value of the t test statistic.
x 7 2 7 3 10
y 4 4 3 4 5
t=1.292
t=0.578
t=0.415
t = 1.203.
See attached file.

The data given below are taken from two independent samples collected randomly.
Claim: (mu)1 > (mu2)2, alpha = 0.10,
sample statistics:
x1 (bar) = 500, s1 = 30, n1 = 100
x2 (bar) = 510, s2= 30, n2 = 75
What is the value of test statistics?