Question
In: Statistics and Probability
A company would like its questionnaire to be completed in 35 minutes on average. 20 people...
A company would like its questionnaire to be completed in 35 minutes on average. 20 people are randomly sampled and it is found that their mean time to complete the questionnaire is 29 minutes with a variance of 64 minutes. Is there sufficient evidence to conclude that the completion time differs from its intended duration? At the 99% degree of confidence, can it be concluded that the completion time differs from its intended duration?
Solutions
orchestra answered 2 years agoRelated Solutions
9A A personnel researcher has designed a questionnaire and she would like to estimate the average...
9A A personnel researcher has designed a questionnaire
and she would like to estimate the average time to complete the
questionnaire. Suppose she samples 100 employees and finds that the
mean time to take the test is 27 minutes with a standard deviation
of 4 minutes. Construct a 90% confidence interval for the mean time
to complete the questionnaire. Also, write a short explanation
about the findings to the human resources director of your company
summarizing the results. – Use...
A government aviation organization would like to determine if the average number of minutes that a...
A government aviation organization would like to determine if
the average number of minutes that a plane departs late differs
among airports in three major cities. The accompanying data were
collected from randomly selected flights and indicate the number of
minutes that each plane was behind schedule at its departure.
Complete parts a and b. Click here to view the late departure
data.
City 1 City 2 City 3
12 9 32
0 18 10
26 0 42...
Sprint would like to investigate if women average more minutes per month talking on their cell...
Sprint would like to investigate if women average more minutes
per month talking on their cell phones than men. The following data
show the number of minutes per month that a random sample of men
and women talked on their cellular telephones, analyzed at alpha =
0.05. Test if the average number of minutes used by women exceeds
the average number of minutes used by men.
t-Test: Two-Sample Assuming Unequal Variances
Women
Men
Mean
Women
461.1
Men
330.7
Variance
...
The average playing time of compact discs in a large collection is 35 minutes, and the...
The average playing time of compact discs in a large collection
is 35 minutes, and the standard deviation is 3 minutes.
(a) What value is 1 standard deviation above the mean? 1
standard deviation below the mean? What values are 2 standard
deviations away from the mean?
1 standard deviation above the
mean
1 standard deviation below the
mean
2 standard deviations above the
mean
2 standard deviations below the
mean
b) Without assuming anything about the distribution of times,...
A cruise company would like to estimate the average beer consumption to plan its beer inventory...
A cruise company would like to estimate the average beer
consumption to plan its beer inventory levels on future seven-day
cruises. (The ship certainly doesn't want to run out of beer in
the middle of the ocean!) The average beer consumption over 19
randomly selected seven-day cruises was 81,788 bottles with a
sample standard deviation of 4,524 bottles. Construct a 90%
confidence interval to estimate the average beer consumption per
cruise (upper and lower limit)
A cruise company would like to estimate the average beer consumption to plan its beer inventory...
A cruise company would like to estimate the average beer
consumption to plan its beer inventory levels on future seven-day
cruises. (The ship certainly doesn't want to run out of beer in
the middle of the ocean!) The average beer consumption over 23
randomly selected seven-day cruises was 81,648 bottles with a
sample standard deviation of 4,596 bottles. Complete parts a and b
below.
a. Construct a 95% confidence interval to estimate the average
beer consumption per cruise. The 95%...
A cruise company would like to estimate the average beer consumption to plan its beer inventory...
A cruise company would like to estimate the average beer
consumption to plan its beer inventory levels on future seven-day
cruises. (The ship certainly doesn't want to run out of beer in
the middle of the ocean!) The average beer consumption over 18
randomly selected seven-day was 81,903 bottles with a sample
standard deviation of 4,585 bottles. Complete parts a and b
below.
A. Construct a 95% confidence interval to
estimate the average beer consumption per cruise.
The 95% confidence...
A cruise company would like to estimate the average beer consumption to plan its beer inventory...
A cruise company would like to estimate the average beer
consumption to plan its beer inventory levels on future seven-day
cruises. (The ship certainly doesn't want to run out of beer in
the middle of the ocean!) The average beer consumption over 19
randomly selected seven-day cruises was 81,838 bottles with a
sample standard deviation of 4,568 bottles. Complete parts a and b
below.
a. Construct a 95% confidence interval to estimate the average
beer consumption per cruise.
The 95%...
Changeover of fixtures on a machine takes 35 minutes. Following the changeover, an average of four...
Changeover of fixtures on a machine takes 35 minutes.
Following the changeover, an average
of four parts must be produced and discarded to make adjustment
before the correct setting is
achieved. For each part the processing time is two minutes and the
material cost is $1.50. The
labor cost for a skilled setup person to do the changeover and
adjustment is $15.50 per hour.
The labor cost of the machine operator is $10.50 per hour.
Currently, the part is produced...
An article was written that on average only 35% of people read, and that the number...
An article was written that on average only 35% of people read,
and that the number of books that are read are correlated to the
reader’s age. A simple random survey was conducted on 34 people.
The binomial question being “Do you read books?”. The 2
quantitative question being: “How many books have you read in the
last 2 years?” and “What is your age”. The results are below: 18
people stated they do not read, 0 books per year....
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