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Confidence intervals
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Questions (715)
Suppose you observe a sample data set consisting of n=64 inter-arrival times X1,…,X64 for the subway, measured in minutes. As
4 answers
asked by
Chibuzo+Ekenna+Ekejiuba
983 views
In sample of 1000 TV viewers, 330 watched a particular programme. Find 99% confidence limits for TV viewers who watch this
4 answers
asked by
pankaj
981 views
Let 𝑋1,…,𝑋𝑛 be i.i.d. random variables with distribution (𝜃,𝜃) , for some unknown parameter 𝜃>0 .
Find an
4 answers
asked by
ramj
2,892 views
50 apples from an orchard are randomly selected. A mean apple diameter of 2.22 inches is calculated with a margin of error for a
23 answers
asked by
Anonymous
2,168 views
Multiple Choice
Which of the following statements is true about the 95% confidence interval of the average of a sample? A) 95 of
6 answers
asked by
Andrew
4,549 views
The standard deviation for a population is σ = 15.3. A sample of 36 observations selected from this population gave a mean
5 answers
asked by
----
2,122 views
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed
4 answers
asked by
Lucky Lady
4,564 views
How large a sample should be selected to provide a 95% confidence interval with a margin of error of 10 (to the nearest whole
4 answers
asked by
Vanessa
7,202 views
A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL
5 answers
asked by
Megan
4,760 views
Help me solve this please. One of the few on my list that I had no idea how to solve.
A medical researcher is interested in the
4 answers
asked by
Ryler
591 views
Which of the following statements best describes the uncertainty associated with a 95% confidence interval for a population
4 answers
asked by
Mary
1,751 views
Find an interval I𝜃 (that depends on 𝜃 ) centered about 𝑋⎯⎯⎯⎯⎯𝑛 such that
𝐏(I𝜃∋𝜃)=0.9for all
3 answers
asked by
Adam
1,616 views
The 92 million Americans of age 50 and over control 50% of all discretionary income (AARP Bulletin, March 2008). AARP estimated
4 answers
asked by
Anonymous
3,523 views
Suppose that 20% of the adult women in the
United States dye or highlight their hair. We would like to know the probability that
4 answers
asked by
Rita
1,524 views
In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with
3 answers
asked by
Mia
3,411 views
To plan the budget for next year a college needs to estimate what impact current economic downturn might have on student
4 answers
asked by
Katie
2,671 views
According to the local real estate board, the average number of days that homes stay on the market before selling is 78.4 with a
4 answers
asked by
Anonymous
1,984 views
A sample poll of 100 voters chosen at random from all voters in a given district indicated that 55% of them were in favor of a
3 answers
asked by
Ras
1,220 views
Given the following information, determine the 68.3 percent, 95.5 percent, and 99.7 percent confidence intervals.
overbar above X
4 answers
asked by
Anonymous Do not understand
1,460 views
You intend to estimate a population proportion with a confidence interval. The data suggests that the normal distribution is a
3 answers
asked by
Denise
1,936 views
Suppose that a SRS of 900 12th-graders has x̅ =148. Based on this sample, a 95% confidence interval for μ is? (σ=35)
I tried
3 answers
asked by
Ceres
2,950 views
Help me solve this please. One of the few on my hw list that I had no idea how to solve
A medical researcher is interested in the
3 answers
asked by
Somi
408 views
A psychic was tested for ESP. The psychic was presented with 400 cards face down and was asked to determine if the card was one
3 answers
asked by
Anonymous
1,210 views
You are given the following information obtained from a random sample of 6
observations. Assume the population has a normal
3 answers
asked by
Katie
1,804 views
the average of the hemoglobin reading for a sample of 20 teachers was 16 gram per 100 milliliters, with a sample standard
3 answers
asked by
nurul
1,443 views
Sugar packaged by a certain machine has a mean weight of 5 lb and a standard deviation of 0.04 lb. For what values of c can the
3 answers
asked by
amd
554 views
A study conducted by an airline showed that a random sample of nine of its passengers disembarking at the Cleveland airport,
3 answers
asked by
Blerp
1,766 views
Given the sample mean of GPA, the sample SD, and the SE below:
SM: 3.2454 SD: 0.4635 SE: 0.0309 construct a 99.7% confidence
4 answers
asked by
Sheri
666 views
For questions 1- 5 use confidence intervals to test the hypothesis.
1) A light bulb producing company states that its lights will
4 answers
asked by
Alexus
1,784 views
According to a study of 90 truckers, a trucker drives, on average, 540 miles per day. If the standard deviation of the miles
3 answers
asked by
Anonymous
2,389 views
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired
5 answers
asked by
Student
1,433 views
One of the questions on a survey of 1,000 adults asked if today's children will be better off than their parents (Rasmussen
3 answers
asked by
Ben
2,418 views
Suppose a 95% confidence interval for the mean salary of college graduates in a town in Mississippi is given by [$36,080,
3 answers
asked by
Help
1,177 views
Fifty two of a test panel of 175 consumers say that they would buy cereal A if it is presented on the market and 35 of another
3 answers
asked anonymously
43 views
The test marks for 29 students studying STSA 1624 produced a mean of 72,8% and a variance of 275,56%. If the distribution of the
3 answers
asked anonymously
40 views
a group of 10 foot surgery patients had a mean weight of 109 kg. The sample standard deviation was 11 kg. Find a confidence
3 answers
asked anonymously
42 views
A sample poll of 100 voters chosen at random from all voters in a given district indicated that 55% of them were in favor of a
3 answers
asked by
farahan
601 views
Suppose a 95% confidence interval for the mean salary of college graduates in a town in Mississippi is given by [$36,080,
3 answers
asked by
Heather
951 views
Fifty two of a test panel of 175 consumers say that they would buy cereal A if it is presented on the market and 35 of another
3 answers
asked anonymously
63 views
A client used two courier services on a random daily basis over a period of 3 months for similar destinations. Delivery times
3 answers
asked anonymously
56 views
the test marks for 29 students studying STSA 1624 produced a mean of 72,8% and a variance of 275,56%. If the distribution of the
3 answers
asked anonymously
44 views
The test marks for 29 students studying STSA 1624 produced a mean of 72,8% and a variance of 275,56%. If the distribution of the
3 answers
asked anonymously
37 views
sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55. Determine
3 answers
asked anonymously
43 views
A sample of 49 observations is taken from a normal population with a standard deviation of 10. The sample mean is 55. Determine
3 answers
asked anonymously
74 views
A group of 10 foot surgery patients had a mean weight of 109 kg. The sample standard deviation was 11 kg. Find a confidence
3 answers
asked anonymously
43 views
ample of 15 test-tubes tested for number of times they cracked gave the sample mean of 1230 with a standard deviation of 270.
3 answers
asked anonymously
35 views
Suppose the following data are selected randomly from a population of normally distributed values.
42 51 43 48 41 57 54 39 45 48
3 answers
asked by
Tyler
2,800 views
the percent defective for parts produced by a manufacturing process is targeted at 4%. The process is monitored daily by taking
4 answers
asked by
American Public University
2,728 views
In a survey randomly selected subjects, the mean age of the 36 respondents is 40.0 years and the standard deviation of the ages
3 answers
asked by
Anonymous
730 views
Recently, a price war has developed among retailers selling Brand X denim jeans. A major chain buyer wishes to estimate the mean
4 answers
asked by
Mike
1,314 views
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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
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Normal Distribution
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Population Proportions
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Probability and Statistical Inference
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Sample size calculation
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Statistical Inference
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