Exam 2: Describing Data: Numerical

Use the following data to construct a box-and-whiskers plot.Find the minimum value,median,first quartile,third quartile,and maximum value. 18 27 34 52 54 59 61 68 78 82 85 87 91 93 100

In a negatively skewed distribution,the mean is always greater than the median.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider the following scores on a 20 point aptitude test for two samples of eight students each: Sample 1: 18,19,17,15,14,20,14,and 16 Sample 2: 14,15,13,11,10,16,10,and 12 -Calculate the variance for the scores in sample 2.

The sum of the deviations from the mean and the median for the set of numbers 1,3,and 5 will equal zero.

Percentiles separate large ordered data sets into tenths so that the fifth percentile is the median.

In a bell-shaped distribution,there is no difference in the values of the mean,and median.

In general,which of the covariance and the sample correlation coefficient is a more useful measure of the relationship between the two variables?

The standard deviation of the scores is:

What would be a reasonable estimate for the 75^th percentile?

Percentiles and Quartiles are generally used to describe which data sets?

The standard deviation of the sample data 13,14,17,and 20 equals:

A recent survey of Fortune 500 firms found that on average,they contribute $332.54 per month for each salaried employee's health insurance.If you are told that almost all salaried employees at Fortune 500 firms receive a health insurance contribution between $220.61 and $444.47,and assuming a bell-shaped distribution,what must the standard deviation for this data be?

The coefficient of variation for the number of citations is:

A sample of size 100 from a bell-shaped population has a mean of 110 and a standard deviation of 10.0.Using the Empirical Rule,about how many items of the sample will be above 130?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The police lieutenant in charge of the traffic division has reviewed the number of traffic citations issued per day by each of the 10 police officers in his division.The data were: 13,21,12,34,31,13,22,26,25,and 23. -What is the mean number of citations issued per day?

Reference to the descriptive measures minimum,first quartile,median,third quartile,and maximum are made by the:

A professor collected data on the number of absences in an introductory statistics class of 100 students over the course of a semester.The data are summarized below. What is the weighted mean number of absences per semester?

Calculate the correlation coefficient between the age and net worth of individuals.

Which measure of central location is used to determine an average annual percent increase?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Ahmed is trying to figure out the relationship between daily sales from his ice cream truck and the daily temperature in Dearborn,Michigan during the month of August.He has collected data on sales Y,measured in dollars,and temperature X,measured in Fahrenheit degrees,over the past 14 days in the form of (x,y)pairs: (72,232),(77,242),(73,219),(69,214),(68,262),(72,218),(75,263),(70,206),(79,300),(73,256),(68,173),(75,210),(81,296),and (68,232). -Prepare a scatter plot of this data.