Questions LLC
Login
or
Sign Up
Ask a New Question
Confidence intervals
Page 7
Questions (715)
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed
3 answers
asked by
Bridget
1,210 views
Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the
1 answer
asked by
Jessica Adamas
707 views
When a confidence interval for a population proportion is constructed for a sample size n = 100 and the value of, p = .4 the
2 answers
asked by
Anonymous
543 views
1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10.
2 answers
asked by
David M.
545 views
Find a confidence interval for ƒÊ assuming that each sample is from a normal population.
a. �P x = 14, ƒÐ = 4, n = 5, 90
2 answers
asked by
Richard
626 views
50 MATH PROFESSORS WERE ASKED HOW LONG IT TAKES TO GRADE A STUDENT'S HOMEWORK ASSIGNMENT. THE MEAN GRADING TIME FOR THE SAMPLE
3 answers
asked by
DARLENE
431 views
Suppose that a random sample of adults has a mean score of on a standardized personality test, with a standard deviation of . (A
2 answers
asked by
Anonymous
1,290 views
Given a level of confidence of 99% and a population standard deviation of 13, answer the following:
(A) What other information is
1 answer
asked by
Jennifer
418 views
For a given month, a random sample of 30 sales girls from a superstore has a sample mean of salary of RM 800 with standard
4 answers
asked by
niki
518 views
A company’s CEO wanted to estimate the percentage of defective product per shipment. In a sample containing 500 products, he
1 answer
asked by
me,me
369 views
We are interested in customer satisfaction ratings for a particular video game. In a
group of 65 customers, we nd a sample mean
1 answer
asked by
michelle
367 views
Would a proportion of 60% be likely, given the calculated confidence interval? Yes/No
Find Answer to: 80% confidence interval
1 answer
asked by
Anonymous
408 views
a sample of 12 observations taken from a normal distribution produced the following data. 13 15 9 11 8 16 4 9 0 14 16 12 .
1 answer
asked by
umray
448 views
A recent study of 750 Internet userd in Europe found that 35% of Internet users were women. What is the 95% confidence interval
1 answer
asked by
will
650 views
Use the following calculations in the relevant formulas to answer the questions
Need Help don't know where to start n = 7
1 answer
asked by
Kieran McCamment
420 views
How many students must we sample if we want to be within 4% of the true proportion of female students at DeVry University when
1 answer
asked by
Anonymous
364 views
identify what is the 95 percent confidence interval for upper class respondents, give you have known their mean=15.34, standard
1 answer
asked by
Nancy
317 views
Select a variable (mean, proportion, variance or standard deviation) of interest to you and collect data consisting of at least
2 answers
asked by
ibrahim
517 views
A sample of 12 observations is selected from a normal population for which the population standard deviation is known to be 4.
1 answer
asked by
liam
728 views
Suppose you took 1000 random samples of size 200 from the Poisson distribution
with u = 5 and computed a 90% confidence interval
1 answer
asked by
Adam
440 views
Suppose you took 1000 random samples of size 200 from the Poisson distribution
with u = 5 and computed a 90% confidence interval
1 answer
asked by
Adam HELP PLEASEEE
491 views
Five years ago, an automobile manufacturer started offering an extended warranty to buyers of its sport-utility vehicle. Â
2 answers
asked by
melissa
649 views
A manufacturer wants to assess the proportion of defective items in a large batch produce by a particular machine. He tests a
1 answer
asked by
shasha
957 views
How to build a 90% Confidence Interval for Profit (When price competitor Pc=5, Wage W=$11)
1 answer
asked by
Cindy
320 views
7. A researcher selects a random sample. A 90% confidence interval for a population mean
A) is an interval with margin of
3 answers
asked by
Anonymous
1,615 views
Can someone tell me what formula I should use?
The number of milligrams of tar in filtered and unfiltered cigarettes is being
1 answer
asked by
Samuel
1,058 views
Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30-gallon
1 answer
asked by
Steve
1,063 views
A group of 56 randomly selected students have a mean score of 30.8 and a
standard deviation of 4.5 on a placement test. Find a
2 answers
asked by
Erica
591 views
In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and
1 answer
asked by
Laura
474 views
In order to make sure that their bags of chips are of sufficient weight, the Chipper Chip Company try to fill their 200 gram
2 answers
asked by
lollzzz
551 views
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on
a very accurate scale. The results
2 answers
asked by
sam
518 views
A sample of 300 is taken and the sample mean is computed to be 7.65 and the sample standard deviation is 5. Assume the data is
1 answer
asked by
Meh
1,001 views
sample of 80 people randomly asked in casino shows that average lost per person is $160 with a sample standard deviation s=$40.
3 answers
asked by
Sonya
336 views
A financial institution wishes to estimate the mean balances owed by its credit card customers. The population standard
2 answers
asked by
Ali
675 views
In a poll of 100 adults, 45% reported they believed in “faith healing.” (USA Today, 20 April 1998). Based on this survey, a
1 answer
asked by
Anonymous
407 views
The results from an independent-measures research study are being used to estimate how much difference there is between two
2 answers
asked by
KiKi
532 views
In the media, numerous surveys are often displayed reporting percentages or proportions. A margin of error is often reported in
2 answers
asked by
cortez
568 views
In a survey, 27 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped
3 answers
asked anonymously
43 views
A company manufactures wind turbines. A random sample of 25 turbines is taken and the sample mean life is 20.00 years with a
1 answer
asked by
Anonymous
459 views
In a random sample of 500 students, 80% say they have a part-time job. An approximate 95% confidence
interval for the proportion
1 answer
asked by
cindy
430 views
Sample of 80 people randomly asked in casino shows that average lost per person is $160 with a standard deviation ó = $40.
3 answers
asked by
HELP
374 views
To compare the durabilities of two paints for highway use, 12 four-inch wide lines of each paint were laid down across a
1 answer
asked by
Desire
393 views
following data values are a simple random sample from a population that is normally distributed, with ssquared=25.0: 47, 43, 33,
1 answer
asked by
Jennifer
441 views
An assembly process includes a torque wrench device that automatically tightens compressor housing bolts; the device has a known
1 answer
asked by
Tonya
492 views
If a sample of size 30 is selected, the value of A for the probability p(>- A) = 0.01 is?
2 answers
asked by
Bryant
521 views
. Over the last 15 Major League Baseball seasons, the mean number of strikeouts by the American League leader is 258.5. Assuming
2 answers
asked by
Karen
914 views
The average price for new mobile homes is known to be distributed with a standard deviation of 350. if a random rample of 49
1 answer
asked by
Sally
436 views
25 periodicals have a mean of $180 and a standard deviation of $12. form a 95% confidence interval on the population mean.
3 answers
asked by
Sally
302 views
consider the following sample statistics from a population that is aproximatly normal. n=15, s= 7.92,level of confidence is 99 %
2 answers
asked by
Angela
682 views
Stat hw question help me please?
In a high profile murder case a sample of the general public's opinions concerning the guilt or
1 answer
asked by
helga
408 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