You want to make a statement about the variability in the costs of personnel shelters. After collecting sample data (cost in $K) on 9 shelters you perform some preliminary calculations.
Given the information provided:
The coefficient of variation is about 17.64%
The variance is about $61.72K
The standard deviation is about $79.36K
The coefficient of variation is about 18.86%
Solution Summary
This solution logically arrives at the right option by performing necessary calculations. Attached in Word.
One sample has SS = 35 and a second sample has SS = 45.
a. Assuming that n = 6 for both samples, calculate each of the samplevariances, then calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two samplevariances.
b. Now assume t
You have been given the sample {0.28, 0.09, 0.22, 0.29, 0.25, 0.68, 0.11, 0.07, 0.02, 0.54} drawn from a population distributed according to .....
(a) Suppose that, for the sample provided, the sample mean is less than the population mean. What does this imply about θ?
(b) Suppose that you are further told that, for t
1] For the samples summarized below, test the hypothesis at = 0.5 that the two variances are equal.
Sample 1 Variance = 25 Number of data values = 9
Sample 2 Variance = 9 Number of data values = 19
Do we reject or not reject and why
2] A marketing firm asked a random set of mar
Problem 1: Calculating sample mean, samplevariance and sample standard deviation
7 8 7 8 8 11 7 9 10 12 9 10 12
10 10 9 8 11 11 11 9 9 12 10 11 10
The table above gives the shoes sizes of 26 members of a football club.
Tasks:
- Enter the data into column A in an Excel sheet. Use the first rows for titles/description
One of the most commonly used statistical techniques is the comparison of two means, also known as the t-test (for this you need quantitative, or interval level data). If you used the same data to compare means with equal sample sizes, how would the results compare if you used the paired sample, independent sample equal varianc
Find the appropriate minimum sample size: You want to be 95% confident that the samplevariance is within 40% of the population variance. Sample size must be an integer.
