Question 1 of 20 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). NOTE: For scientific 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.
Assume 50 random samples of the same sample size are taken from a population, and a 90% confidence
interval is constructed from each sample. How many of the intervals would you expect to contain the true
population mean?
Answer:
Round your answer to a whole number value as necessary. For
example, 37 would be a legitimate entry. Question 2 of 20 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). NOTE: For scientific 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.
The personnel department of a large corporation wants to estimate the family dental expenses of its
employees to determine the feasibility of providing a dental insurance plan. A random sample of 12
employees reveals the following family dental expenses (in dollars): 115, 370, 250, 593, 540, 225, 177,
425, 318, 182, 275, and 228.
Construct a 99% confidence interval estimate for the standard deviation of family dental expenses for all
employees of this corporation.
Place your LOWER limit, in dollars rounded to 1 decimal place, in the first blank. Do not use a dollar sign,
a comma, or any other stray mark. For example, 98.4 would be a legitimate
entry.
Place your UPPER limit, in dollars rounded to 1 decimal place, in the second blank. Do not use a dollar
sign, a comma, or any other stray mark. For example, 567.8 would be a legitimate
entry. Question 3 of 20 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). NOTE: For scientific 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. The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is
mound-shaped and symmetric with a mean of 24.6 mpg and a standard deviation of 11.2 mpg. If 30 such
cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 27?
Answer:
0.1357 would be a legitimate entry. Round your answer to 4 decimal places as necessary. For example, 1.0 Points Question 4 of 20 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). NOTE: For scientific 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. A lawyer researched the average number of years served by 45 different justices on the
Supreme Court. The average number of years served was 13.8 years with a standard
deviation of 7.3 years. What is the 95% confidence interval estimate for the average
number of years served by all Supreme Court justices? Place your limits,rounded to 1
decimal place, in the blanks. Place you lower limit in the first
blank. Place your upper limit in the second blank.
When entering your answer do not use any labels or
symbols. Simply provide the numerical value. For example, 12.3 would be a legitimate
entry.
Question 5 of 20 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). NOTE: For scientific 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 95% 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. Place your UPPER limit, in hours, rounded to 1 decimal place, in the second blank. For example, 12.3
would be a legitimate entry.
1.0 Points Question 6 of 20 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). NOTE: For scientific 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.
The percent defective for parts produced by a manufacturing process is targeted at 4%. The process is
monitored daily by taking samples of sizes n = 160 units. Suppose that today’s sample contains 14
defectives.
Determine a 95% confidence interval for the proportion defective for the process today.
Place your LOWER limit, rounded to 3 decimal places, in the first blank. For example, 0.123 would be a
legitimate answer.
Place your UPPER limit, rounded to 3 decimal places, in the second blank. For example, 0.345 would be a
legitimate entry.
1.0 Points Question 7 of 20 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). NOTE: For scientific 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.
You are trying to estimate the average amount a family spends on food during a year. In the past, the
standard deviation of the amount a family has spent on food during a year has been ? = $ 1 2 0 0 .
If you want to be 99% sure that you have estimated average family food expenditures within $60, how
many families do you need to survey? Place your answer, a whole number, in the
blank . For example, 1234 would be a legitimate entry. Part 2 of 3 – Question 8 of 20
Confidence intervals are a function of which of the following three things?
A.The sample, the variable of interest, and the degrees of freedom 1.0 Points B.The sampling distribution, the confidence level, and the degrees of
freedom
C.The population, the sample, and the standard deviation
D.The data in the sample, the confidence level, and the sample size
Reset Selection Question 9 of 20 1.0 Points Compute P( t15 ?2.0) where t15 has a t-distribution with 15 degrees of freedom. A.0.93606
B.0.96803
C.0.7639
D.0.03197
Reset Selection Question 10 of 20
Which of the following will make a confidence interval narrower and more precise? 1.0 Points A.Larger sample size and lower confidence
level
B.Smaller sample size and higher confidence
level
C.Smaller sample size and lower confidence
level
D.Larger sample size and higher confidence
level
Reset Selection
1.0 Points
Question 11 of 20
A previous study of nickels showed that the standar

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