Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of72 and a standard deviation 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals (a) Find the 32 percentile of the scores. (b) Find the 67 percentile of the scores. (c) The instructor wants to give an A to the students whose scores were in the top 8% of the class. What is the minimum score needed to get an A?

Q: One sample of scores has a mean of M = 45 and a sample size of n = 10 scores.  A second sample of…

A:

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Q: The HR team collects the age of the staff of three departments and found the mean age of each…

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Q: Subject 1st 2nd #1 10 11 #2 4 6 #3 7 9 #4 6 5   a. Calculate the mean difference. b. Calculate SS…

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Q: Iculate the mean and median and report the lower value of two.

A: Answer The sample size [n] = 10-7.4, -3.4, -2.7, -2.2, -1.9, -0.8, 0.3, 0.9, 0.9, 1.1The mean:The…

Q: the mean = 146, and s =  35 Question #3 A percentage of female students with scores between 41 and…

A: From the provided information, Mean (x̅) = 146 Standard deviation (s) = 35

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Q: Two individuals a spatial abilities test (mean = 80, std. dev. = 8). One scores a 76 and the scores…

A: From the given information,

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A: First let us sort the head circumferences (in inches) for the players on the team; No. Head…

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A: P value=0.0  Hypothesis. H0: μ1 − μ2 = 0 Ha: μ1 − μ2 ≠ 0 (claim)

Q: Calculate the average (mean) of the data shown, to two decimal places x 29.2 4 9.9 5.9 21.4

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Q: What does “statistically significant” mean in this context? (More than one answer is correct. Select…

A: Hypothesis Testing is a type of inferential procedure is statistics.

Q: Proportion of fatalities by location of injury for motorcycle accidents Abdomen/ Full data set…

A: Null and alternative Hypothesis H0:- The distribution of fatal injuries for riders not wearing a…

Q: The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  = 11.…

A: The scores on the Wechsler Adult Intelligence Scale are approximately Normal

Q: ve an opinion about which population will have a higher mean score. Here are her hypotheses. H0:…

A: Given The data is as follows:

Q: The number of hours per week that the television is turned on is determined for each family in a…

A: Given that mean = 32 hours Median = 28.2 hours 7th percentile = 17 hours

Q: How is the goal of descriptive statistics served by putting scores in a frequency distribution?

A: It is an important part of statistics . It is widely used .

Q: Find the z-score that corresponds to the 63rd percentile

A: we have to find the Z-score that corresponds tothe 63rd percentile.

Q: number of hours per week that the television is turned on is determined for each family in a sample.…

A: Given that  Mean = 30 Median = 26.2

Q: x 1.8 2.3 6.7 11.3 16.7 25.2 26.9 27.9

A: Percentile is the value in the data set below which certain percentage of the data lie.   The…

Q: A sample of nine tourists indicated how much they spent on accommodation per night (in dollars) at a…

A: The given data is as follows:313.6, 151.6, 598.5, 222.7, 293.9, 272.6, 198.5, 382.0, 188.7

Q: The percentile is the:   Question 5 options:   same thing as a percentage.   percentage of scores…

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Q: Find the 5 number summary for the data shown x 3.9 5.4 6.5 8.9 11.3 11.8 24.6 27.8 28.4

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Q: An instructor grades as follows: unit exams 20%, project 30%, and final exam 50%. A student had…

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Q: If the mean of a data set is 22 and the SD is 5, what % of the values fall between 12 and 27? Give a…

A: given that  mean of a data set is 22

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.