# Sample Standard Deviation Of The Sample Wins Essay

1604 Words Dec 9th, 2016 7 Pages
1. Find the mean and standard deviation of the sample WINS: [4 POINTS]

Sample Mean: 80.05

Sample Standard deviation: 11.9405

2. Assume that the population is normally distributed, but the population standard deviation is not known. [8 POINTS]

(a) Use your sample data to find a 95% confidence interval for the true mean number of wins for all Major League teams: -Next Page

(b) State the margin of error of the confidence interval: 5.5883

(c) How can you increase the precision of this confidence interval, without changing the sample size?

Use a lower confidence level: Decreasing the confidence level will decrease the width of the confidence interval. This will lead to a narrower and a more precise confidence interval.

3. Assume that the population standard deviation is 10 and assume the population is approximately normally distributed. Find the sample size that would be required to determine a 95% confidence interval if we want to be within 3 games of the true mean. That is, we want the margin of error, e, to not exceed 3 games. [4 POINTS]
-Next Page

4. Using your sample data, conduct a hypothesis test at the alpha = 0.05 significance level. You may assume that the population standard deviation is not known and that the population is approximately normally distributed. [14 POINTS

Is there sufficient evidence to conclude that the mean number of wins for all teams is more than 75? (a)

(b) Using the critical value approach: State…

## Related Documents

• ###### Essay on Multiple Sample Hypothesis

Running head: MULTIPLE SAMPLE HYPOTHESIS TESTING Multiple Sample Hypothesis Testing RES342: Research 11 June 14, 2010 Multiple Sample Hypothesis Testing The purpose of this paper is to create a hypothesis based on two-sample tests. Two-sample tests compare two sample estimates with each other, whereas one-sample tests compare a sample estimate with a non-sample benchmark (Doane & Seward, 2007). The learning team has chosen to create a hypothesis testing using the wages and wage earners…

Words: 1209 - Pages: 5
• ###### Sample Preparation : Wilcox Shale And Pottsville Shale Samples

SAMPLE PREPARATION: Wilcox shale and Pottsville shale samples are tested with the indentation method in this experiment. Both samples are quartz rich and silty shales which contain about 45 to 50% of quartz, 40 to 45% of clays and about 5% of plagioclase. Wilcox shale sample is from Louisiana and formed in upper Cretaceous while Pottsville shale samples are from Alabama and formed in upper Pennsylvanian. These two type of shale rocks are chosen because they are “local” rocks which was abundant and…

Words: 976 - Pages: 4
• ###### Population Standard Deviation Essay

REVIEW EXERCISES CHAPTER 8 AND 9 PROFESSOR JONAS WIU-RES BY DEBRA JAMES CHAPTER 8 1. High temperature in the United States a meteorologist claims that the average of the highest temperatures in the united states in 98. A random sample of 50 cities is selected, and the highest temperatures are recorded. The data are shown. At a=0.05 can the claim be rejected? a=7.7 97, 101, 99, 99, 100, 94, 87, 99, 108, 93, 96, 88, 98, 97,88, 105, 97, 96, 98, 102, 99, 94, 96, 114, 99, 96, 98, 97, 91,…

Words: 823 - Pages: 4
• ###### Essay The Standard Deviation Of 16.4

standard deviation of 16.4. This latter, the standard deviation is an indication of the dispersion, or how widely the reported scores spread out around the mean value of 85.1. Here, although the mean and the median are almost identical, the former is preferable because it provides a better representation across the spectrum of data, and therefore a better measure of central tendency (Thorndike & Thorndike-Christ, 2009). But with a mode of 66.0, it shows that some data are far off the mean, however…

Words: 1208 - Pages: 5
• ###### Essay Sample

SWOT analysis & draw conclusions and/or forecasts from it. With these strategies, they can stay updated with consumer lifestyles and competitor new proposition development. Kraft foods can also conduct primary research by conducting surveys and sample promotions of their products ahead of release in order to test the market and its response. Lastly, they can hire lawyers or legal paralegals that help guide the company legally through key decisions. Law specialists will always be updated with…

Words: 1475 - Pages: 6
• ###### Essay Standard Deviation Of The Second Water

ppm of CaCO3 present in all three trials conducted. The standard deviation from these tests was 0. Kroger water had a 46.2 ppm of CaCO3 in the first trial, 50 ppm in the second trial, and 43.2 ppm in the third trial. The standard deviation of the second water sample was 3.41. Crystal Geyser water had a 16.42 ppm of CaCO3 in the first trial, 21 ppm in the second trial, and 22 ppm in the third trial. The standard deviation of the third sample was 2.97. According to the table provided, 0-50 CaCO3…

Words: 1230 - Pages: 5
• ###### Sample Size Essay

Agricultural Education and Communication | Program Evaluation | Sampling | Israel, Glenn D Determining Sample Size1 Glenn D. Israel2 Perhaps the most frequently asked question concerning sampling is, "What size sample do I need?" The answer to this question is influenced by a number of factors, including the purpose of the study, population size, the risk of selecting a "bad" sample, and the allowable sampling error. Interested readers may obtain a more detailed discussion of the purpose of…

Words: 3772 - Pages: 16
• ###### Essay Standard Deviation and Percentage

Steakhouse. The average Remington’s patron statistics are listed in Table 1. Table 1: Demographic Description of the Average Remington’s Patrons ------------------------------------------------- Variable Mean Central Tendency Variance Standard Deviation Age 42 2.09 1.45 Gender Male 0.24 0.49 ------------------------------------------------- Number of Children 1 – 2 0.76 0.87 Income \$50,001 - \$75,000 2.09 1.45 The average Remington’s patron is…

Words: 6617 - Pages: 27
• ###### Standard deviation abstract Essays

Standard Deviation Abstract QRB/501 Standard Deviation Abstract Standard Deviations Are Not Perverse Purpose: The purpose of this article is to illustrate how using statistical data, such as standard deviation, can help a cattleman choose the best lot of calf’s at auction. The statistical data used in these decision making processes can also help the cattleman with future analysis of the lots purchased and existing stock. Research Question: How can understanding the standard deviation…

Words: 1478 - Pages: 6
• ###### Essay The Determination Of A Sample

The determination of a sample has a significant impact on a definitive nature of the exploration. In quantitative studies, there is a pronounce relationship into the study, where the examining strategy has an immediate bearing on the unwavering quality, legitimacy, dependability, and generalizability of the study. Consequently, in a quantitative examination, prescriptive tenets for selecting tests and models for ascertaining sufficient sample size have created. A little haphazardly chose test damages…

Words: 1005 - Pages: