BusStat Exam #2
What proportion of coffee drinkers consumed from 6 kilograms up to but not including 7 kilograms?
40.28%
For the 75th percentile in this data set, we will use the value at the ___th position.
8 because i = (.75)(10) = 7.5 and the n we have to round
Calculate for k
=log(1214.2) or 2^11
What value goes in the numerator of the weighted mean formula?
$3,393,000
Taking into account the number of days worked, mean quarterly sales equals ___ .
$8,440 Divide the numerator by the sum of all days worked
Below is a histogram created in Excel for Windows, using the Insert / Chart / Histogram tool. It shows the results of a survey question that asked how many years a member has belonged to a particular fitness club. In which class do we count those members who have been with the club exactly 4 years? /(2,4] and (4,6] * (2,4] Because we have overlapping classes, we can't include people who have been a member of the club for exactly 4 years. (4,6]
(2,4]
independent variable and dependent variable
(Scatter plot) x-axis = __ y-axis =
What class has the highest frequency?
19 to 21
Using a k of 11 and a range of 56, your class width should have been 6. Based on that class width, what class has the highest frequency?
31-36
positive, that is, increasing
The scatter plot shows a __ relationship between the independent and dependent variable.
When i is a whole number, round up to the next i.
False
Why two y-axes?
To allow for 2 dissimilar scales.
What does the trend line show? (WilsonGreen)
Steady increase in sales over time
Histograms
Classes can be integrer or non-integer Boundaries are mostly 'up to but not including' The bars tough (unlike in a bar chart) Try not to have empty classes
To show how the price of a stock has changed over the last 3 months, the best type of chart to use is: a pie chart. a bar chart. a line chart. a histogram.
line chart
In this example, what is the 'other factor' that affects income?
number of days worked
Given a set of data with 11 values, the 40th percentile is at ___ .
the 5th position
The actual line for WilsonGreen's customer growth is more of an S-Shape
true
relationship; quantitative
The purpose of a scatter plot is to show the __ between two ___ variables.
scatter plot
The relationship between the two quanititative variables
The 40th percentile is this data set of 10 values equals ___ .
3 i = *(40/100)(10) = 4
A professor wants to know if the amount of time her students spent working on a statistics assignment relates to the grade the student receives. She surveyed 10 students and recorded the data below. Which of the following statements is most correct? /A histogram will illustrate whether a linear relationship exists between the number of hours studied and the grade received. None of these charts are appropriate. A scatter diagram would be useful for displaying a relationship between the number of hours studied and the grade received. A line chart for these data will show a trend between the student number and the grade received.
*A scatter diagram would be useful for displaying a relationship between the number of hours studied and the grade received.
Which of the following is NOT true of a bar chart? /a. It can show either frequency or relative frequency. b. The bars can be either horizontal or vertical. c. It is used for categorical data. d. It is used for numerical data.
*It is used for numerical data.
Consider the following chart. Which of the following statements is most correct? (Scattered graph) /The variable on the horizontal axis should be the independent variable. /A scatter plot like this one shows the trend in the data over time. The values in a scatter plot should all be connected to one another. /The change in the dependent variable is caused by the independent variable.
*The change in the dependent variable is caused by the independent variable.
One of the key differences between a bar chart and histogram is: a. the histogram should contain gaps between the bars while the bar chart may not contain gaps between the bars. /b. the histogram shows relative frequency while the bar chart shows frequency. c. the bar chart uses vertical bars while a histogram must use horizontal bars. d. a bar chart may display more than one variable while a histogram displays the distribution of a single quantitative variable.
*d. a bar chart may display more than one variable while a histogram displays the distribution of a single quantitative variable.
The city counsel has just voted to pass the city's budget for next year. If you were writing a report describing the budget so the citizens could understand the proportion of tax dollars allocated to each budget category, which of the following graphs will be most appropriate? /Pie chart Scatter diagram /Histogram Line chart
/Histogram
A student team in a marketing research class conducted a survey of 100 people at the local movie theater and asked which type of movie each person most preferred. Which graph is most appropriate to represent the results? Select all that apply. pie chart /bar graph (not touching, skinny) bar graph (touching, wide) line graph
/Pie Chart /bar graph (not touching, skinny)
How many survey respondents are in the class (31,37}?
230
classes; frequency count or relative frequency
A graph of a frequency distribution with the horizontal axis showing the ___, the vertical axis showing the ___ ____, and (for equal class widths) the rectangles having a height equal to the frequency in each class.
A data analyst is reviewing the last 28 years of data on the number of employees at a company, and that company's annual income. If the analyst wants to determine how employment and income levels have changed over time, which type of graph would be appropriate? A scatter plot with Income on the x axis and Employees on the y axis. Two pie charts, one showing the proportion of income by year, the other showing proportion of employees by year. /A line chart with a primary vertical axis to display Income and a secondary vertical axis to display Employees. A bar chart with Employees assigned to one bar color and Income assigned to another bar color.
A scatter plot with Income on the x axis and Employees on the y axis.
What is the best way to describe the class which has the highest frequency in the histogram we created with the Histogram chart function?
Greater than 19, up to and including 22
What does the trend line tell us about flood insurance since 1990?
It has increased over time
That a value of 30 would be counted in class 30 up to 60
Looking at a histogram, what would it mean if the boundaries are 'up to but not including'?
The graph below was created in Excel using Pivot Charts after I created a Pivot Table. The gray labels at the top and bottom of this Pivot Chart are called ______. Hint: You may wish to refer to the chapter 2 part 2 PowerPoint slides. /Axis labels /Field buttons Pivot buttons /Chart titles
Pivot Buttons
The Fitness Center manager has collected data on the number of visits to the club each week for the past 8 weeks. These data are shown as follows. Which of the following statements is most correct? Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 1415 1623 1934 1879 2102 2156 2511 2499 The dataset should be plotted in a pie chart because it's a qualitative variable.. /The dataset should be plotted on a line chart because it's time-series data. The dataset should be plotted on a histogram because it's a quantitative variable. The dataset should be plotted on a bar chart because it's categorical data.
The dataset should be plotted on a histogram because it's a quantitative variable.
Which is the best explanation for why the histogram based on your pivot table has a different shape that the Histogram built with the Insert/Chart function?
The lower boundary is included, and the upper boundary is excluded, in the Pivot Chart. That is reversed in the Histogram chart.
True
The trend line shows a positive relationship between Club Staff Satisfaction and Overall Service Satisfaction.
Which of the following is NOT one of the issues with the histogram on the bottom right?
The y-axis label 'Frequency' is not descriptive enough.
(31,37} means that ages from 32 through 37 are included in the frequncy count for that class. (T or F)
True
The first quartile in this data set is the 3rd item, with a value of 3.
True
The frequency histogram and the relative frequency histogram for Danish Coffee drinkers has the same shape.
True
The 2nd quartile is also the median
True. 50% are above and 50% below the midpoint.
Line Chart
Two-dimensional chart showing time on the horizontal axis and the variable of interest on the vertical axis. Depicts quantitative, time-series data
