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Confidence intervals
Page 10
Questions (715)
The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 18. A random
2 answers
asked by
lupita
937 views
An organization sends a random sample of surveys to 100,000 people and received 4,781 responses. A) Give a 95% confidence
1 answer
asked by
Shane
917 views
In a survey of 621 males ages 18-64 , 396 say they have gone to the dentist in the past year.
Construct 90% and 95% confidence
2 answers
asked by
Christina
945 views
A class survey in a large class for first-year college students asked, “About how many minutes do you study on a typical
2 answers
asked by
jordon
918 views
The diameter of small Nerf balls manufactured at a factory in China is expected to be approximately normally distributed with a
4 answers
asked by
Josh
889 views
A random survey of 500 households
determines that 20% of the households would do so and that each participating household expects
2 answers
asked by
Jamie
889 views
Given the following statistical list:
13,17,19,22,25,27,29,29,32,and 33. Assuming a desired "Confidence Level" of 95%, find the
1 answer
asked by
Adam
889 views
It costs you $10 to draw a sample of size n=1 and measure the attribute of interest. You have a budget of $1,200.
a. Do you have
2 answers
asked by
Meagan
904 views
Given a level of confidence of 99% and a population standard deviation of 12, answer the following:
(A) What other information is
1 answer
asked by
Valerie
887 views
A random sample of 51 of the largest companies in the united states gave the following P/e ratios
11 35 19 13 15 21 40 18 60 72 9
2 answers
asked by
Anonymous
888 views
solve: our health organization is interested in estimating the average value of outstanding accounts receivable. After selecting
2 answers
asked by
Winona
890 views
)The random sample shown below was selected from a normal distribution
Complete parts (a) and (b). Construct a 99% confidence
2 answers
asked by
Carol Harper
875 views
A manufacturer of light bulbs has sampled 40 bulbs in order to determine the population mean life of the bulbs.
The sample mean
2 answers
asked by
t
875 views
A random sample of size 81 is taken from a large population, measuring the time it takes to complete a driver’s license
2 answers
asked by
Devika
869 views
Are you annoyed with spam e-mail? Suppose a random sample of 200 Kent State students was asked this question of which 80% said
1 answer
asked by
Sheri
865 views
1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license
3 answers
asked by
Anonymous
877 views
1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99%
3 answers
asked by
Cam
876 views
According to a recent pole only 21% of Americans were satisfied with the direction the U.S. is heading. To investigate the
1 answer
asked by
Bill
838 views
In a random sample of 1,000 exams, the average score was 500 points with a standard deviation of 80 points. Find the interval
2 answers
asked by
King
842 views
The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke.
1 answer
asked by
Anonymous
857 views
Prof. C is studying a population of the elementary school pupils in a school district with data on all its children. Another
2 answers
asked by
Kevin
868 views
In the third week of July, a random sample of 61 farming regions gave a sample mean of = $6.88 per 100 pounds of watermelon.
2 answers
asked by
Desperate
838 views
True or false? If the original x distribution has a relatively small standard deviation, the confidence interval for will be
3 answers
asked by
Desperate
846 views
1. A certain population follows a normal distribution, with mean m and standard deviation s = 2.5. You collect data and test the
1 answer
asked by
Latoya
832 views
A single sample is being used to construct a 90% confidence interval for the population mean. What would be the difference
2 answers
asked by
Anonymous
822 views
Suppose we take a random sample of size n from a normal population with variance, σ2 . It can be shown that (n−1)s2/σ2 has a
2 answers
asked by
sandy
846 views
Can someone please help me understand how confidence intervals fit within the broader context of inferential statistics
2 answers
asked by
patiance
808 views
In a poll of 1,004 adults, 93% indicated that restaurants and bars should refuse service to patrons who have had too much to
2 answers
asked by
Ben
809 views
2. The new Twinkle bulb has a standard deviation hours. A random sample of 77 light bulbs is selected from inventory. The sample
3 answers
asked by
stefanie
817 views
A 95% confidence level for the difference between u1 and u2 runs from -2 to +6. From this we can infer that
a. u1 is probably
5 answers
asked by
Kevin
807 views
Again sorry for all the questions. please help, I am not good at stats and find these questions very difficult. I would
2 answers
asked by
penelope
500 views
Suppose that 2,000 scientists compute 90% confidence
intervals for parameters they are interested in. How many of these intervals
1 answer
asked by
Erika
795 views
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within one
1 answer
asked by
badel
814 views
A high school counselor is interested in the percentage of students who will be going
to college. She randomly picks 60 students
1 answer
asked by
Jamie
816 views
n a survey of 634 males ages 18-64, 392 say that they have gone to the dentist in the past year
contrast 90% and 95% confidence
1 answer
asked by
MOE
797 views
identify what is the 90 percent confidence interval for occupational prestige for respondents with only a bachelor's degree
2 answers
asked by
Nancy
773 views
A simple random sample of 25 has been collected from a normally distributed population for which it is know that o=17.0. The
2 answers
asked by
Joe
813 views
2. A sociologist conducted a study of divorce patterns in a Midwestern city. In the study, 200 divorced people were selected at
1 answer
asked by
Tian
487 views
A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their contents.If the sample mean is
2 answers
asked by
GRACE
793 views
Which of the following would increase the width of a confidence interval?
Changing from a 99% to 95% confidence level. Increasing
2 answers
asked by
Susie
803 views
The average cost per night of a hotel room in New York City is $273 (SmartMoney, March 2009). Assume this estimate is based on a
2 answers
asked by
Vanessa
766 views
What is meant by the 95% confidence interval of the mean?
2 answers
asked by
Ramon
757 views
what happens to the width of our confidence interval for mu if we increase the sample size but keep the confidence level the
2 answers
asked by
jen
785 views
A 95% confidence level for the difference between u1 and u2 runs from -2 to +6. From this we can infer that
a. u1 is probably
1 answer
asked by
Kevin
765 views
Thirty-three small communities in Connecticut (population near 10,000 each) gave an average of x = 138.5 reported cases of
1 answer
asked by
Amy
759 views
In a simple random sample of 80 patients that go to a certain dentist, 9 patients had their teeth whitened. which interval is
2 answers
asked by
Clay
755 views
Randomly selected students participated in an experiment to test their ability to determine when one minute(or sixty seconds)
2 answers
asked by
anonymous
752 views
Here are summary statistics for randomly selected weights of newborn girls: n=217, x=31.7hg, s=6.5hg. Construct a
1 answer
asked by
Anonymous
747 views
When calculating a confidence interval for the difference between two means, what information are one gaining?
2 answers
asked by
jamie
767 views
Annual starting salaries for college graduates with degrees in business administration are generally expected to be between
1 answer
asked by
Vanessa
729 views
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