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Probability & Measures of Central Tendency
Solve the following problems showing your work:
In a poll, respondents were asked whether they had ever been in a car accident. 157 respondents indicated that they had been in a car accident and 117 respondents said that they had not been in a car accident. If one of these respondents is randomly selected, what is the probability of getting someone who has been in a car accident?
The data set represents the income levels of the members of a country club. Find the probability that a randomly selected member earns at least $88,000
total, 14 of them at or above $88,000 means the probability is:
In a certain class of students, there are 15 boys from Wilmette, 5 girls from Kenilworth, 9 girls from Wilmette, 6 boys from Glencoe, 2 boys from Kenilworth and 8 girls from Glencoe. If the teacher calls upon a student to answer a question, what is the probability that the student will be from Kenilworth?
Kids from Kenilworth / Total number of kids
(5 + 2) / (15+5+9+6+2+8) = 7/45 = .156
4. Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses are made and each...
Of 1936 people who came into a blood bank to give blood, 220 people had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.
220/1936 = .114
expectations:
Use information from the reference readings as well as any good quality resource you can find. Please cite all sources and provide a reference list at the end of your paper.
The following items will be assessed in particular:
1. Identify the meaning of independent and dependent events.
2. Calculate probabilities and joint probabilities of simple events.
3. Explain the basic logic of probability theory
Solve the following problems showing your work (Measures of Central Tendency)
1. Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mean retirement age.
(57+62+62+55+66+58+65+50+50)/9 = 58.33
2. A store manager kept track of the number of newspapers sold each week over a seven-week period. The results are shown below.
36…
Tutorial on Measures of Dispersion, Retrieved February 12, 2011, from http://www.childrens-mercy.org/stats/definitions/stdev.htm
Overview of Measures of Dispersion, Retrieved November 12, 2008, from http://www.unc.edu/~knhighto/econ70/lec2/lec2.htm
Standard Deviation in the Stock Market, Retrieved August 27, 2008, from http://www.trade10.com/standard_deviati.htm
Probability Probabilities according to Becker and Parker (2011) are used in both simulations and real life scenarios to help in the estimation of the occurrence of events. In the words of Gravetter and Wallnau (2008), "for a situation in which several different outcomes are possible, the probability for any specific outcome is defined as a fraction or a proportion of all the possible outcomes." In that regard, chance and randomness are
6, and the chances of rain is 0.4. Historical data may be used for forecasting, but past patterns will not necessarily be reliable. To gain a more reliable assessment there are alternatives; the weather service makes advanced forecasts based on a large amount of data. However, to gain this information the business will have to pay a fee. This means that there is a cost associated with gaining the more accurate
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Looking at the variability of each group is important because it gives the decision-maker an indication of how wide is the spread of scores of each worker in the group. That is, through measures of variability, the decision-maker is informed of just how varied the manual dexterity scores of the workers are, since it would be most efficient for him/her to have workers who at least have the same levels/scores
measure situations of reality (Piquero, 2002). A dependent variable and an independent variable are studied for patterns of relation, covariance, and cause and effect. For example, the relationship between impulsivity, the independent variable, and criminal behavior, the dependent variable, or the effects of a mandatory arrest policy, the independent variable, on future patterns of domestic violence, the dependent variable, are both examples of quantitative research. For causality, three criteria