Exam 1 bonus MATH 116

Exam 1 bonus MATH 116 - SHOW ALL WORK(round to four...

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Statistics NAME________________________ SHOW ALL WORK MTH 116 (round to four decimals Exam #1 where appropriate) ************BONUS ASSIGNMENT******** 1) Make a histogram of the following data set from a survey. Response | Number Strongly Disagree 155 Disagree 115 No Opinion 25 Agree 116 Strongly Agree 156 1a) Is the histogram symmetric or skewed to the left or right ? ANS_______________ 2)a) Find the mean, standard deviation, median, the two quartiles, and the minimum and maximum of the following data set. Also, make a box-plot of the data set. {1.7, 4, 71.4, 8.9, 23, 6.7, 99, 39, 44, 4, 81} mean=______________ STD=______________ median=____________ Q1=_____________ Q3=_____________ min=________ max=____________ n = _____________ b) Between what two values is the bottom 25%? ANS_______________ 3) Use the 68 - 95 - 99.7% rule or standardize to find the following percentages (probabilities). The Octane level of a certain brand of premium gasoline is normally distributed with a mean of 91 octane and a standard deviation of 3.1 octane a) What percent of the time is the octane less than 91? ANS_________________ ( P(X< 91) ) b) What percent of the time is the octane between 94.1 and 97.2? ANS_________________ ( P(94.1< X< 97.2) ) c) What percent of the time is the octane greater than 87.9? ANS_________________
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( P(87.9< X) )
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4) Let z be the standardized normal variable (z-score or z-stat). a) Find the probability that z is greater than 2.15.
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Exam 1 bonus MATH 116 - SHOW ALL WORK(round to four...

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