Questions LLC
Login
or
Sign Up
Ask a New Question
Confidence intervals
Page 6
Questions (711)
Students enrolled in an introductory statistics course at a university were asked to take a survey that indicated whether the
3 answers
asked by
James
1,644 views
help please!!!
1. The average number of bumped passengers per day on FliRite Airlines is 2.47 with a standard deviation of 1.75.
2 answers
asked by
penelope
618 views
Which of the following confidence intervals will be the widest?
a. 90 percent b. 95 percent c. 80 percent d. 98 percent
3 answers
asked by
penelope
1,524 views
Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume
1 answer
asked by
Glenn D
468 views
Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume
5 answers
asked by
tracy10
720 views
Find the 98% confidence interval for estimating ìd based on these paired data and assuming normality. (Give your answers
1 answer
asked by
tracy10
1,052 views
Consider the following. (Give your answers correct to two decimal places.)
(a) Determine the value of the confidence coefficient
2 answers
asked by
Tommy7
847 views
Consider the following. (Give your answers correct to four decimal places.)
(a) Determine the level of confidence given the
1 answer
asked by
Tommy8
388 views
Consider the following. (Give your answers correct to two decimal places.)
(a) Determine the value of the confidence coefficient
1 answer
asked by
Tommy8
396 views
While writing an article on the high cost of college education, a reporter took a random sample of the cost of new textbooks for
2 answers
asked by
TOM95
501 views
A machine produces parts with lengths that are normally distributed with ó = 0.52. A sample of 16 parts has a mean length of
2 answers
asked by
TOM7
508 views
Consider the following. (Give your answers correct to four decimal places.)
(a) Determine the level of confidence given the
3 answers
asked by
Tom 84
973 views
Consider the following. (Give your answers correct to two decimal places.)
(a) Determine the value of the confidence coefficient
4 answers
asked by
Webster85
408 views
Can someone give me simple formulas for the below problems. What I found is too confusing.
A sample of 145 values is randomly
3 answers
asked by
Gayle 79
513 views
Could someone work one of these out so I can use as example.
A sample of 59 night-school students' ages is obtained in order to
1 answer
asked by
DeeDee 89
753 views
Two hundred fish caught in Cayuga Lake had a mean length of 14.1 inches. The population standard deviation is 2.9 inches. (Give
3 answers
asked by
Tom 81
681 views
Consider the following. (Give your answers correct to two decimal places.)
(a) Determine the value of the confidence coefficient
1 answer
asked by
Tom 8
340 views
I have like 9 more of these problems, can someone please help me out so I can get started. thanx JS
In a random sample of 35
1 answer
asked by
Jessica
377 views
I have like 9 more of these problems, can someone please help me out so I can get started. thanx JS
In a random sample of 35
1 answer
asked by
Jessica
431 views
A Toyota dealer wants to find out the age of their customers (for advertising purposes). They want the margin of error to be 3
3 answers
asked by
Ahmad Syukri
674 views
Suppose that you are in charge to see if dropping an iPhone 5 will damage it. You want to find the proportion of iPhone 5 that
1 answer
asked by
Ahmad Syukri
455 views
In a random sample of 95 sections of pipe in a chemical plant, 16 showed signs of serious corrosion. Construct a 98% confidence
1 answer
asked by
probability
358 views
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.
1) n =
2 answers
asked by
t
540 views
Thirty random students took the final. If the sample mean was 86 and the standard deviation was 9.2 construct a 99 percent
1 answer
asked by
t
378 views
In a random sample of 78 teenagers, 32 admit to texting while driving. Construct a 98% confidence interval for the percentage of
2 answers
asked by
MELISSA
589 views
The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies,
2 answers
asked by
chris
1,030 views
I am having trouble finding an article that incorporates research of confidence intervals to market a new product. I will need
1 answer
asked by
Tameika
335 views
In a transportation study of 20 large cities, it was found that the mean of the number of cars per person was 0.504. (Some of
1 answer
asked by
chris
407 views
3. Sick-leave records obtained from a random sample of 200 social workers showed a mean number of days sick leave equal to 25.6
2 answers
asked by
CYNTHIA
504 views
One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the
1 answer
asked by
Christina
463 views
One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the
1 answer
asked by
Christina
478 views
What is the confidence level of each of the following confidence intervals for u?
x+/-1.96(o/SR N) ht t p : / / w w w . a l l i a
1 answer
asked by
ginger
397 views
30 percent of the employees at a large biotech firm are working from home. [You may find it useful to reference the z table.]
a.
3 answers
asked anonymously
130 views
Hi,
I need some help with a problem. Here is my example that I am studying. Find a 95% C.I. for the population mean. Same size 36
2 answers
asked by
Robocop
680 views
waiting times for 64 randomly selected walk-in customers and determined that their mean waiting time was 15 minutes. Assume that
3 answers
asked by
jack
497 views
a basketball scout randomly selected 144 players and timed howlong eah player took to perform a certain drill. the times in
4 answers
asked by
gina
550 views
A study of 50 mathematics professors showed that they spend, on average,12.4 minutes correcting a student's final examinations.
2 answers
asked by
Laddi
584 views
An apple grower is trying to produce larger fruit by using a new fertilizer. The usual fertilizer produces fruit with a mean
1 answer
asked by
Heather
430 views
Assume that the population is normal. A sample of size 100 is taken. The resultant sample data has a mean of 48 and a standard
1 answer
asked by
Heather
480 views
Thirty five percent of adult americans are regular voters. A random sample of 250 adults in a medium size college town were
2 answers
asked by
Tessa
902 views
Compare the 95% and 99% confidence intervals for the hours of sleep a student gets. Explain the difference between these
1 answer
asked by
KAOS
388 views
Can anyone please help me explain confidence intervals.
How does one tell/determine if a confidence interval is too wide? What
1 answer
asked by
Rory
298 views
The following confidence interval is obtained for a population proportion, p:0.556 < p < 0.584. What is the point estimate, p?
2 answers
asked by
1234
1,021 views
use a 95% confidence interval to estimate the difference between the population means. Interpret the confidence interval. random
1 answer
asked by
Terri
360 views
What is construct a 95 percent confidence interval about the sample mean N= 11?
1 answer
asked by
Tracy
285 views
4. Data from the 2008 General Social Survey (GSS) sample show that the mean number of children per respondent was 1.94 with a
1 answer
asked by
taylor quenzler
436 views
If the confidence interval obtained is to wide. How can the width of this interval be reduce and which alternative is the best
4 answers
asked by
Fakaapo. Suetusi
391 views
Consider the average available for all hotel rooms from the previous assignment. Identify the point estimate of the average
1 answer
asked by
JULIET
441 views
Bad Wheels Tire Company is interested in estimating the proportion of defective tires that it produces. The company tested a
1 answer
asked by
Kim
386 views
A public heath official wanted to know how often university students visit their student health centers due to illness or
2 answers
asked by
Cat
484 views
Pages
1
2
3
4
5
6
7
8
9
10
Parent Categories (55)
Biostatistics
Data Analysis
Data Analysis and Interpretation
Data Analysis and Sampling
Data collection and analysis
Descriptive Statistics
Estimating Means and Variances
Estimation
Hypothesis Testing
Hypothesis Tests
Inference
Inferential Statistics
Market Research
Mathematics and Statistics
Maximum Likelihood Estimation
Normal Distribution
Parameter Estimation
Polling
Polling and Surveys
Population Proportions
Probability
Probability and Distributions
Probability and Sampling
Probability and Statistical Inference
Probability and Statistics
Proportions
Regression Analysis
Research Methods
Sample size calculation
Sample Surveys
Sampling
Sampling and Estimation
Sampling and Surveys
Sampling Methods
Statistical Analysis
Statistical Estimation
Statistical Hypothesis Testing
Statistical Inference
Statistical Inferences
Statistical Sampling
Statistics
Statistics analysis
Statistics and Data Analysis
Statistics and Hypothesis Testing
Statistics and Probability
Statistics and Sampling
Statistics or Data Analysis
Statistics or Mathematics
Statistics/Statistical Analysis
Survey analysis
Surveys
Surveys and Data Analysis
Surveys and Polls
Visitor Numbers
Warranty expenditure