# Essay on Statistics

1486 Words Jun 5th, 2016 6 Pages
Data Visually and Through Numbers
Data File 2 - Chapter Three (Show all your work) 1) A teacher asked each of her students how many novels they had read in the previous six months. The results are shown below.

0 1 5 4 2 1 3 2
2 7 2 5 0 1 0 1
1 2 6 0 2 3 1 2
7 1 4 2 3 1 7 0
0 2 1 1 0 6 1 7
Construct a frequency table for the number of novels read.
Solution:
Number of novels read | Frequency | 0 | 7 | 1 | 11 | 2 | 9 | 3 | 3 | 4 | 2 | 5 | 2 | 6 | 2 | 7 | 4 |

2) The frequency table shows the weights in ounces of 30 stones
Weight (oz) Number of Stones

1.2-1.6 5
1.7-2.1 2
2.2-2.6 5
2.7-3.1 5 3.2-3.6.1.1 13

Use the above information to construct a cumulative frequency
20, 43, 46, 43, 49, 43, 49
Solution: The mode is 43 because this value occurs most often in the sample data. 4) The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619, 626, and 633. Suppose that the student with the score of 533 drops the seminar and is replaced by a student with a score of 765. What will happen to the mean and the median scores of the class? Explain.

Solution: 4128 | sum | | 589.7143 | | Mean | 589.7 | | Median | 586 | | | | | | | | | | | 4360 | sum | | 622.8571 | | Mean | 622.9 | | Median | 619 |

They both increase. Since the mean is the average score, dropping the lowest score and adding a higher score will increase the average. The median is the middle score, so dropping the lowest score and adding a new highest score has the effect of moving the middle score up to the next student.

5) Suppose there are 400 students in your school class. What class rank is the 20th percentile?

Solution: The 20th percentile is the value that separates the bottom 20% of the 400 students from the top 80%. In other words, the 20th percentile is greater than or equal to at least

## Related Documents

• ###### Essay Worksheet Statistics

the governors were 44, 36, 52, and 40 square feet. The figures for the CEOs were 32, 60, 48, 36 square feet. a. Figure the means and standard deviations for the governors and CEOs. b. Explain, to a person who has never had a course in statistics, what you have done. c. Note the ways in which the means and standard deviations differ, and speculate on the possible meaning of these differences, presuming that they are representative of U.S. governors and large corporations’ CEOs in general…

Words: 913 - Pages: 4
• ###### Essay statistics GCU

A problem with random sampling would be if you’re looking for specific information about your chosen subject and the people whom give you results for your study don’t have any knowledge or conditions that relate to your topic. Grove, Susan K. Statistics for Health Care Research: A Practical Workbook. W.B. Saunders Company, 022007. Jeanette, I agree with you regarding if samples in studies are not taken randomly then they would result in possible biases with in the community. Asking someone…

Words: 2632 - Pages: 11
• ###### Statistics Essay

every level of education. 1.2. The alternative hypothesis H1 is μ1 ≠ μ2 or μ2 ≠ μ3 or μ1 ≠ μ3 (at least one μ is different from another μ). 1.3. In order to test the above pair of hypotheses, I will use ANOVA analysis that provides the F statistic significance test: H0: FF critical H0 is rejected The following table contains the results of the ANOVA analysis: Anova: Single Factor SUMMARY Groups Count Sum Average Variance PRIMARY 115,00 3944657…

Words: 1147 - Pages: 5
• ###### Statistic Essay

Statistics – Lab #6 Name: Hemanshu Patel Statistical Concepts: * Data Simulation * Discrete Probability Distribution * Confidence Intervals Calculations for a set of variables * Open the class survey results that were entered into the MINITAB worksheet. * We want to calculate the mean for the 10 rolls of the die for each student in the class. Label the column next to die10 in the Worksheet with the word mean. Pull up Calc > Row Statistics and select the radio-button…

Words: 1100 - Pages: 5
• ###### Statistics Essay

“ Statistics should be interpreted with caution as they can be misleading; they can both lie and tell the truth” Statistics are being used everyday to describe things in working and studying areas to show the productivity of the results they are hoping for. Therefore, people observe and notice alternative objects the world around. Throughout this fact, similarities and differences are such features that could endanger or turned out as advantages. This is called statistics. Explanations…

Words: 1063 - Pages: 5
• ###### Statistics Paper

trouble again. The Deputy Director has just resigned in the midst of rumors going around the departments about discrimination, lawsuits, and even the company picnic has been canceled. I would like to seek your help in putting together an Ad hoc Statistics Report to be submitted to the CEO so that he can make the appropriate corrective, proactive, and retroactive decisions for the troubled company. The Report Format As you might have known already, my brother, the Jordan & Associates…

Words: 1381 - Pages: 6
• ###### Statistics Essays

average numbers of every family (FAMSIZE), URB is the percent of people live in urban, UR is the level of people have no job over 16 years and the median family income in US dollars (INCOME). Descriptive statistics, correlation and regression will be used in this project. 2. Descriptive statistics Variable | Mean | Median | Mode | VAR | STDEV | URB | 58.76034483 | 66.15 | 0 | 1012.828049 | 31.82495953 | FAMSIZE | 3.140172414 | 3.135 | 2.93 | 0.033377163 | 0.182694178 | UR | 9.293103448…

Words: 1660 - Pages: 7
• ###### Statistics Essay

Business Statistics WISE-International Master Hypothesis Testing  A hypothesis is a claim (conjecture/assumption) about a population parameter:    population mean population proportion It is always about a population parameter, not a sample statistic A Common Theme Check the merits of this hypothesis based on sample information sample A hypothesis is formed about some population parameter  infer Hypothesis testing provides a general framework for approaching…

Words: 3356 - Pages: 14
• ###### Essay Statistics Midterm

MM207 Statistics Unit IV Mid Term Project 1. In the following situation identify the implied population. A recent report on the weekly news presented the findings of a study on the effectiveness of Onglyza, along with diet and exercise, for treating diabetes. According to Bennett (2009), a population is defined as “the complete set of people or things being studied” in a statistical study. Given that the information is in relation to finding the success of a drug used to care for…

Words: 1626 - Pages: 7
• ###### Statistics Essay

General Lectures 1-4 What is statistics? Discipline: collecting, classifying, summarizing, organizing, analyzing and interpreting numerical information. -A means to answer research questions (and to test hypothesis). -No scientific proof: make plausible through empirical data with an empirical observed result. Shape and skewness:  Negatively skewed: mean < median  Symmetry: mean = median  Positively skewed: mean > median Mode = the score that occurs most frequently. Median = middle score when…

Words: 2216 - Pages: 9