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Confidence Interval
Page 7
Questions (364)
a survey conducted by the u.s department of labor found the 48 out of 500 heads of house holds were unemployed compute a 99%
2 answers
asked by
bernie
564 views
A business researcher wants to estimate the average number of years of experience an account manager has working with the
2 answers
asked by
alessandria
574 views
What is the critical z used to form a 85% confidence interval?
2 answers
asked by
Heaven
545 views
Can you please help with this question. The only thing that I have come up thus far is that I am using the z critical value
2 answers
asked by
Jim
543 views
Suppose we have a set of body temperature with a mean of 97.6 degrees and a standard deviation of 0.3 degrees. between what two
4 answers
asked by
Debora
531 views
In a 95% confidence interval approximately how many intervals would you expect to contain the population proportion and how many
2 answers
asked by
anonymous
520 views
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher
2 answers
asked by
Katie
537 views
Sample size= 16 mean=3.48 and standard deviation=0.92. For a 99% confidence interval, what is the Margin Of Error
2 answers
asked by
Knight
508 views
In 2015, the average price of new homes in a certain suburb was $145,000. Assume that this
mean is based on a random sample of
2 answers
asked by
Jerold
545 views
There are 300 students enrolled in Business Statics . Historically,exam scores are normally distributedwith a standard deviation
2 answers
asked by
Leslie Meagan
519 views
The mean age of the 43 presidents of the United States (as of 2011) on the day of inauguration is 54.6 years, with a standard
2 answers
asked by
N
527 views
What critical t value would be needed to construct a 90% confidence interval on a sample of size 22?
1.717 1.323 2.080 1.321
2 answers
asked by
Clueless
526 views
Determine the 90% confidence interval for a sample, taken from a normally distributed population, that has a mean of 685, a
2 answers
asked by
Tierra
533 views
Determine the 90% confidence interval for a sample, taken from a normally distributed population, that has a mean of 685, a
2 answers
asked by
Tierra
514 views
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard
deviation of 15. A researcher
2 answers
asked by
Sally
527 views
A survey of 925 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 90%
2 answers
asked by
Lizzy
504 views
Construct a 95% confidence interval for the population mean. 5. Airfare A random sample of airfare prices (in dollars) for a
2 answers
asked by
anna
526 views
What price do farmers get for the peach crops? in the third week of June, a random sample of 40 farming regions gave a sample
2 answers
asked by
Justina
492 views
Statistics students were asked to go home and fill a 1-cup measure with raisin bran, tap the cup lightly on the counter three
2 answers
asked by
Kat
502 views
We want an estimate of the mean time required for ships of a particular class to cross the Pacific Ocean from San Francisco to
2 answers
asked by
Angel
505 views
b. A mobile company XYZ wants to conduct a survey to find the proportion P of those customers that are happy with the purchase
1 answer
asked by
aima
520 views
Help!!!!!!
A confidence interval estimate for the population mean is given to be (39,90, 48.11) If the standard deviation is
2 answers
asked by
amy
496 views
A recent survey of students on the question “Do you think the United States should retain or abolish the use of the penny as a
1 answer
asked by
Kayse
498 views
A pilot sample of 50 measurements of the breaking strength of cotton threads gave S_(pr) = 18 grams. Determine the sample size
2 answers
asked by
Zabe
490 views
In a study of 200 students, 42 were found to have a GPA greater than 3.0. Find a
98% confidence interval estimate of the
2 answers
asked by
Jason
508 views
A random sample of 384 people in a mid-sized city (city one) revealed 112 individuals who worked at more than one job. A second
1 answer
asked by
twetwewtw
500 views
Please only the formula and step I need for this problem. thank you
In response to media inquiries and concerns expressed by
1 answer
asked by
Lina
506 views
5.
What happens to the width of our confidence interval for m if we increase the sample size but keep the confidence level the
1 answer
asked by
ali awan
494 views
A statistician is testing the null hypothesis that exactly half of all engineers will still be in the profession 10 years after
1 answer
asked by
Anonymous
470 views
you are asked to estimate the average weight of an adult male passenger for a study to maximize the number of seats in a certain
2 answers
asked by
KK
479 views
sing the 95% confidence level and the 11th grade male writing scores in the Class Data file, you would expect the lower end of
2 answers
asked by
Anonymous
472 views
suppose a sample of 2404 tenth graders is drawn.Of the sampled, 601 read at or below the eighth grade level. using the data,
1 answer
asked by
kyle
480 views
Please advise-Thank you.
The Center for Urban Transportation research released a report stating that the average commuting
5 answers
asked by
vera
465 views
An automobile shop manager times six employees and found that the average time it took then to change a water pump was 18
2 answers
asked by
katelyn
466 views
assume that a sample is used to estimate a population proportion p. find the margin of error E that corresponds to the given
1 answer
asked by
daniel
479 views
The data below are the ages of a random sample of 8 men in a bar. It is known that the population of ages are normally
1 answer
asked by
lupita
474 views
A survey of 100 commuters finds the average commuting to work is 25.5 minutes with the standard deviation of 11.5 minutes.
1 answer
asked by
julie
469 views
The following data gives the amount of time (in minutes), it took a sample of 16 patients with hypertension to achieve their
1 answer
asked by
Jen
454 views
A sample of 25 men has a mean weight of 65kg with standard deviation of 8kg. Suppose that the weight of men follows normal
1 answer
asked by
Ali
463 views
In one day, a random security check of 65 travelers at JFK
international airport would cause 17 of those travelers to be
1 answer
asked by
Trish R
472 views
A study found that 8-to 12-year olds spend an average of $18.50 per trip to mall. If a sample of 49 children was used, find the
1 answer
asked by
Anonymous
450 views
Determine Confidence Interval or Margin of Error
12. A study was commissioned to find the mean weight of the residents in certain
1 answer
asked anonymously
43 views
A planner wants to determine the percentage of students who will attend summer classes. She surveys 32 students and finds that
1 answer
asked by
Judy
451 views
The average price for new mobile homes is known to be distributed with a standard deviation of 350. if a random sample of 49
1 answer
asked by
April
460 views
Produce a 99.9 % confidence interval for the population mean body temperature of a healthy male. Then do the same for the
1 answer
asked by
j
451 views
In a random sample of 112 State College students, 41 students reported being current smokers.
a) Calculate the 95% confidence
1 answer
asked by
Anonymous
449 views
a basketball scout randomly selected 144 players and timed how longeach player took to perform a certain drill. The times in the
1 answer
asked by
mary
450 views
A recent study of 25 students showed that they spend an average of $18.53 for gas per week. The sample standard deviation was
1 answer
asked anonymously
34 views
A sample of 6 adult elephants had an average weight of 12,200 pounds, with a sample standard deviation of 200 pounds. We know
1 answer
asked anonymously
55 views
You intend to estimate a population proportion with a confidence interval. The data suggests that the normal distribution is a
1 answer
asked anonymously
43 views
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