Ashford mat 126 (survey of mathimatical methods) week 5 dq & quiz a+

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Ashford MAT 126 Week 5


Ashford MAT 126 Week Five Discussion

This Discussion will give you the opportunity to calculate or identify the three measures of central tendency. You will be asked to select an appropriate real life situation in which one measure would be more appropriate than the other two measures of center.

  1. Select a topic of interest to you and record the topic in your posting, for example: “What is the average number of hours people watch TV every week?” Make sure the question you ask will be answered with a number, rather than answers with words.
  2. Write a hypothesis of what you expect your research to reveal. Example: Adults 21 years and over watch an average of 2.5 hours of TV per day.
  3. Sample at least fifteen people and record their data in a simple table or chart; study the examples from Section 12-3.
  4. You can gather your data at work, on the phone, or via some other method. This is your “Sampling Design.” Which of the four sampling techniques best describes your design?
  5. Explain in moderate detail the method you used to gather your data. In statistics this venture is called the “Methodology.”
  6. Make sure you break your sample into classes or groups, such as males/females, or ages, or time of day, etc.
  7. Calculate the mean, median, and mode for your data as a whole.
  8. Now calculate the mean, median, and mode of each of your classes or groups.
  9. Indicate which measure of central tendency best describes your data and why. Then compare your results for each class or group, and point out any interesting results or unusual outcomes between the classes or groups. This is called a “comparative analysis” – using our results to explain interesting outcomes or differences (i.e., between men and women).
  10. Comment on at least two of your classmates’ postings. Make sure you comment on their hypothesis (topic), their design, and whether you agree or do not agree with their best measure of central tendency.

·         MAT 126 Week 5 Assignment (Misleading)


Ashford MAT 126 Week 5 Quiz 20 MCQ’s


·          Find the area under the normal distribution curve between z = 1.52 and z = 2.43.

·         For the 20 test scores shown, find the percentile rank for a score of 86.
75 63 92 74 86 50 77 82 98 65 71 89 75 66 87 59 70 83 91 73

·         If a student’s percentile rank in a class of 400 students is 87, find the student’s class rank.

·         Find the value for the correlation coefficient r

·         Find the median.
2 27 38 55 49 9 53 34

·          Find Q1, Q2, and Q3 for the data set below.
5.4    2.0    6.8    3.1    2.9    4.7    2.1    5.0    1.9    3.4

·         The average amount customers at a certain grocery store spend yearly is $636.55. Assume the variable is normally distributed. If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.

·          The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed. If the standard deviation is $4.58, find the probability that a randomly selected employee earns less than $5.43.

·         Use a scatter plot to deternine the relationship between the x values and the y values.

·         If a student’s rank in a class of 400 students is 44, find the student’s percentile rank.

·         Fran’s percentile rank on an exam in a class of 500 is 85. Kelly’s class rank is 60. Who is ranked higher?

·         The area under a normal distribution curve that lies within one standard deviation of the mean is approximately _____.

·         Find the area under the normal distribution curve to the right of z = –1.03.

·         Find the area under the normal distribution curve to the right of z = –3.24.

·         Armia’s percentile rank on an exam in a class of 300 is 85. Sanjo’s class rank is 42. Who is ranked higher?

·         Determine whether a correlation coefficient of r = –0.405 is significant at the 5% level for a sample size of 22.

·         Find the standard deviation.
44 46 33 10 50 27

·         Find the median and the mean for the data set below.
5.4   2.0   6.8   3.1   2.9   4.7   2.1   5.0   1.9   3.4

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