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1. Construct a histogram and a frequency polygon for the following data.
Class Interval
Frequency
30-under 32
5
32-under 34
7
34-under 36
15
36-under 38
21
38-under 40
34
40-under 42
24
42-under 44
17
44-under 46
8
2. Are the advertising dollars spent by a company related to total sales revenue? The following data represent the advertising dollars and the sales revenues for various companies in a given industry during a recent year. Construct a scatter plot of the data from the two variables and discuss the relationship between the two variables.
Advertising (in $millions)
Sales (in $millions)
4.2
155.7
1.6
87.3
6.3
135.6
2.7
99.0
10.4
168.2
7.1
136.9
5.5
101.4
8.3
158.2
What fraction of the calls last between 4.2 and 5 minutes?
construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
43 students, 22are sophomores, 28are chemistry majors, and 11are neither. What are the probability that the student is both a sophomore and a chemistry major?
if the standard deviation for a population as estimated from a sample is s 5.6 then the standard error for a sample
Create a frequency distribution and histogram for this variable, and calculate the mean, median, and standard deviation. Describe how BankTen compares with other banks in terms of profits per employee.
question 1 a loaf of bread is normally distributed with a mean of 22 oz and a standard deviation of 0.5 oz. what is the
A prison official wants to estimate the proportion of cases of recidivism. In examining 250 convicts there are 65 cases. with 99% confidence interval what is the range? How do you figure this type of problem?
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the following are the hours of operation to failure of 38 light bulbs.150 389 345 310 20 310 175 376 334 340 332 331
What is the net income of SouthCo if unit sales are twice the break-even point for a given month?
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