Quiz 3_MATH302
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Part 1 of 3 -
5.0/ 7.0 Points
Question 1 of 20
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). For scientific NOTE:
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
Senior management of a consulting services firm is concerned about a growing decline in the firm’s
weekly number of billable hours. The firm expects each professional employee to spend at least 40
hours per week on work. In an effort to understand this problem better, management would like to
estimate the standard deviation of the number of hours their employees spend on work-related activities
in a typical week. Rather than reviewing the records of all the firm’s full-time employees, the
management randomly selected a sample of size 51 from the available frame. The sample mean and
sample standard deviations were 48.5 and 7.5 hours, respectively.
Construct a 99% confidence interval for the standard deviation of the number of hours this firm’s
employees spend on work-related activities in a typical week.
Place your LOWER limit, in hours, rounded to 1 decimal place, in the first blank. For example, 6.7 would
be a legitimate entry. 5.9
Place your UPPER limit, in hours, rounded to 1 decimal place, in the second blank. For example, 12.3
would be a legitimate entry. 10.0
Answer Key: 5.8|6.1, 9.9|10.1
Question 2 of 20
1.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). For scientific NOTE:
notation, a period MUST be used as the decimal point marker.
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.
If a sample has 25 observations and a 99% confidence estimate for is needed, the appropriate value
of the t-multiple required is 2.797 . Place your answer, rounded to 3 decimal places, in the blank. For
example, 3.456 would be an appropriate entry.
Answer Key: 2.797
Question 3 of 20
0.0/ 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces
(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). For scientific NOTE:
