Please answer all of the parts and questions. Question 1: Part A: The manager of

Question

Please answer all of the parts and questions.

Question 1: Part A: The manager of Hudson Auto would like to gain a better understanding of the cost of parts used in engine tune-ups in the shop. Invoices of 50 customers are randomly selected and the cost of parts, rounded to the nearest dollar, are as tollows 91 78 93 57 7552 99 80 97 62 71 69 72 89 66 75 79 75 72 76 104 74 62 68 97 105 77 65 80 109 85 97 88 68 83 68 71 69 67 74 62 82 98 101 79 105 79 69 62 73 1. What is the target population for this study? 2. Are these cross-sectional or time-series data? Why? 3. What is the variable (X) of interest? 4. The above data can be organized into a frequency distribution by doing the following a) Compute the class width (round up to the nearest dollar) for creating 6 non-overlapping classes b) Use the class width in part a" to complete the table below by providing the remaining upper and lower limits of the 6 non-overlapping classes to 5. Provide in the table below the adjusted limits (upper and lower) that you would use to construct the histogram for the dataset. to to to 6. Suppose Excel reports -1.7 as the coefficient of skewness for the dataset. Complete this statement: This means that the histogram from this dataset will be long tail to the values and few skewed with a with the implication that the dataset contains many values 7. Suppose the sample mean is 79, and the sample standard deviation is 14. Are there outliers in the data? Please provide the statistical evidence in support of your answer

Explanation / Answer

1. The target population are the customers who buy auto parts from engine tune up shops.

2. The data is cross sectional as it is collected at a particular point in time.

3. The variable of interest is the cost of a part.

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