Ch. 2

What is necessary to be determined to define the classes for a frequency distribution with quantitative data?

# of nonoverlapping bins, width of each bin, and bin limits

For data having a bell shaped distribution, approximately ___percent of data values will be within one standard deviation of the mean

68

In a survey of patients in a local hospital, 62.42% of respondents indicated health care providers should spend more time with each patient. Who makes up the sample?

All survey respondents

Which of the following graphs provides information on outliers and IQR of a data set?

Box plot

Data collected from several entities at the same point in time

Cross-sectional data

Data collected from several entities over a period of time are called

Time Series Data

Any data value with a z-score of less than -3 or greater than +3 is considered to be

an outlier

In a survey of patients in a local hospital, 62.42% of the respondents indicated that the health care providers needed to spend more time with each patients. Who makes up the population? a. All survey respondents b. All patients in local hospital c. Hospital patients

b. All patients in local hospital

The correlation coefficent will always take values

between -1 and +1

Which of the following relationships would have a negative correlation coefficient? a. Cost of car and tax to be paid b. Supply and Demand c. Amount of bill at restaurant and amt. of tip d. The square footage of a home and price of a home

c.

Shows the number of data items with values less than or equal to the upper limit of each class a. cumulative frequency distribution b. frequency distribution c. percent frequency distribution d. relative frequency distribution

cumulative (a)

graphical summary of data previously summarized in a frequency distribution

histogram

The _ is a point estimate of the population mean for the variable of interest a. sample mean b. median c. sample d. geometric mean

sample mean

If covariance between two variables is near zero, it implies that

variables are not linearly related

The goal regarding using appropriate number of bins is to show the

variations in data