Tuesday

February 21, 2017
Number of results: 24,179

**stats**

The following data were collected from a case-control study of breast cancer and fat intake: case control High-fat diet 10 5 Low-fat diet 40 55 50 60 Statistical inferences for odds ratios are based on the natural log of the odds ratio, rather than the odds ratio itself (...

*July 16, 2013 by thane*

**Literacy**

Which would have the greatest negative influence on child literacy? single parenting, minority ethnicity, minimal parental education, or low socioeconomic status I am thinking low socioeconomic status, but I am not real positive. Please give help.

*September 24, 2007 by Anonymous*

**Epidemiology**

• Consider each of the following scenarios and explain whether the variable in question is a confounder: a. A study of the relationship between exercise and heart attacks that is conducted among women who do not smoke. Explain whether gender is a confounder. b. A case-...

*October 17, 2010 by Joe*

**epidemiology**

Assessing Random Error, Confounding, and Effect Modification Although researchers do their best to reduce error within every study, there will always be error. It is important to identify and report any possible error within the research study in order to accurately interpret ...

*October 10, 2010 by Roxana*

**STATISTICS**

A study examining the relationship between fetal X-ray exposure and a particular type of childhood blood cancer found the following odds ratio (and 95% confidence interval) for the association: 2.44 (0.95 to 6.33). This result would likely be considered: clinically significant...

*August 7, 2013 by Susie*

**STATISTICS**

A study examining the relationship between fetal X-ray exposure and a particular type of childhood blood cancer found the following odds ratio (and 95% confidence interval) for the association: 2.44 (0.95 to 6.33). This result would likely be considered: a. clinically ...

*August 10, 2013 by smoothjive*

**Early child ed. /literacy question**

I posted this question yesterday- and some felt that minimal parental education may have the greatest negative influence on child literacy. Whowever, one person seemed to think that low socioeconomic status has the greatest negative influence on child literacy. Which may have ...

*September 25, 2007 by Anonymous*

**psychology**

what would the dependent and independent variable and control and experimental group be in this problem: John is intrigued by the relationship between frustration and aggression. He proposes to study whether socioeconomic status is a factor in how drivers express their ...

*September 18, 2007 by Lydia*

**epidemiology**

11. A study to assess the relationship between smoking and lung cancer found that the odds ratio is 4. Using your own words, interpret the odds ratio.

*June 19, 2014 by chy*

**ESL proof reading**

States. We are living in a same society but some people tend to be healthy and some tend to be less healthy. Many factors contribute to health status of the population such as individual behaviors, physical environment, education, culture and social environment, and ...

*October 19, 2013 by sham*

**statistics**

What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval? What percentage of times will the mean, or population proportion, not be found within the confidence interval?

*April 30, 2010 by Amy*

**Stastics**

Which of the following descriptions of confidence intervals is correct? (Select all that apply) a. If a 95% confidence interval contains 0, then the 99% confidence interval contains 0 b. If a 99% confidence interval contains 0, then the 95% confidence interval contains 0 c. If...

*April 25, 2016 by Lindsay*

**RES 341**

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 ratio level. Compute the 95% confidence interval on the mean. Compute the 3.9% confidence interval on the mean Which confidence interval is more ...

*October 16, 2010 by Meh*

**Statistics**

Which of the following statements best describes the uncertainty associated with a 95% confidence interval for a population proportion, computed from a simple random sample? A. We don't know whether the particular confidence interval is successful or not, but 95% of ...

*May 18, 2012 by Mary*

**statistics**

Refer to Table 1 in the article “Snail Shells in a Practical Application of Statistical Procedures” in the Electronic Reserve Readings. Find the margin of error, E, with a confidence interval of your choosing (50-99%). What is the significance of choosing a confidence ...

*April 26, 2012 by len*

**Environmental Management**

A. The 95% confidence interval is: (a) Larger than the 99% confidence interval (b) Smaller than the 99% confidence interval (c) The same as the 99% confidence interval

*July 13, 2009 by Jox*

**research methods**

determining variables and identifying this type of quasi-exp design for this study is confusing: Study: lower socioeconomic status student benefit more over time from an academic tutoring program than higher socioeconomic students. Now: looks like this is a longitudal exp. DV ...

*February 23, 2013 by donna*

**Math-Stat Help**

In a random sample of 78 teenagers, 32 admit to texting while driving. Construct a 98% confidence interval for the percentage of teenager that text while driving. Start by showing that conditions for constructing a confidence interval are met. 1) Check conditions 2) confidence...

*April 11, 2013 by MELISSA*

**Statistics**

In 1998 a San Diego Reproductive clinic reported 49 live births to 207 women under the age of 40 who had previously been unable to get pregnant. Using the 90% confidence interval calculated above, would it be misleading for the clinic to report a success rate of 25%? A) Yes, ...

*October 27, 2013 by Jeffrey*

**Statistics**

The standard deviation for a population is σ = 15.3. A sample of 36 observations selected from this population gave a mean equal to 74.8. a) Make a 90% confidence interval for μ b) Construct a 95% confidence interval for μ. c) Determine a 99% confidence interval...

*November 21, 2013 by ----*

**BIOLOGY - LAB**

What is Confidence Interval? Is it better to have a large Confidence Interval or a small Confidence Interval? Briefly explain.

*March 24, 2009 by biology*

**statistics**

An experimental egg farm is raising chickens to produce low cholesterol eggs. A lab tested 12 randomly selected eggs and found that the mean amount of cholesterol was x = 186 mg. The sample standard deviation was found to be s = 19.0 mg on this group. Assume that the ...

*April 6, 2010 by looking for someone to varify my work please*

**graduate statistics**

Do children from lower socioeconomic status (SES) neighborhoods have lower than average test-taking skills? A researcher administered a standard measure of test-taking skills to a randomly chosen child from a low SES neighborhood and found him to have a score of 38. The ...

*July 3, 2013 by Anonymous*

**Statistics**

The 95% confidence interval is: (a) Larger than the 99% confidence interval (b) Smaller than the 99% confidence interval (c) The same as the 99% confidence interval

*October 28, 2007 by Thano*

**Statistics**

Multiple Choice Which of the following statements is true about the 95% confidence interval of the average of a sample? A) 95 of 100 avgs of samples will be within the limits of the confidence interval. B) There is a 95% chance the avg of the population to be within the limits...

*July 26, 2013 by Andrew*

**Statistics**

We have calculated a 95% confidence interval for a proportion and would prefer the confidence interval to be more precise, that is narrower. Using the same sample, we can narrow the confidence interval using which of the following? A) increasing the confidence level B) ...

*October 27, 2013 by Nick*

**Statistics**

1. A certain population follows a normal distribution, with mean m and standard deviation s = 2.5. You collect data and test the hypotheses H0: m = 1, Ha: m 1. You obtain a P-value of 0.022. Which of the following is true? Why? a. A 95% confidence interval for m will include ...

*November 29, 2008 by Latoya*

**Statistics**

A savings and loan association needs information concerning the checking account balances of its local customers. A random sample of 20 accounts was checked and yielded a mean balance of $664.14 and a standard deviation of 235.29. Assume the data is normally distributed. Find ...

*April 22, 2015 by Giselle*

**Statistics**

Can anyone help me with this? Which of the following statements is true about a 99% confidence interval? a. The interval contains 99% of the population. b. The probability that the population mean is in the interval is 99%. c. The interval is wider than a 95% confidence ...

*October 7, 2016 by Angel*

**MATH**

The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information: $231,500 $279,900 $...

*November 30, 2014 by LADO*

**Math 11**

I am really stuck at these 4 questions. Pls help: a) Two spheres of the same density have a ratio of 9 to 16 inches in surface area, If the small sphere weighs 15 kg what does the sphere weighs. Answer to the nearest 10th of KG. b) The ratio of the volume of two cubes is 216 ...

*April 7, 2014 by MK*

**Math Stats**

The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information: $231,500 $279,900 $...

*November 30, 2014 by STATS 3*

**math 3**

The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information: $231,500 $279,900 $...

*December 4, 2014 by LADO*

**Statistics**

A confidence interval for a population mean has a margin of error of 3.1. a)Determine the length of the confidence interval. b)If the sample mean is 56.7, obtain the confidence interval.

*May 21, 2014 by Anonymous*

**stat**

A company’s CEO wanted to estimate the percentage of defective product per shipment. In a sample containing 500 products, he found 30 defective products. (a) Find a 98% confidence interval for the true proportion of defective product. Show your calculations and/or explain ...

*August 20, 2011 by me,me*

**STATISTICS**

In a cross-sectional study of heart disease and gender in middle-aged men and women, 10% of men in the sample had prevalent heart disease compared with only 5% of women in the sample. After adjusting for age in multivariate logistic regression, the odds ratio for heart disease...

*August 6, 2013 by Susie*

**Statistics**

A random sample of 90 observations produced a mean that = 25.9 and a standard deviation s =2.4 (a)Find a 95% confidence interval for u (b)Find a 90% confidence interval for u (c)Find a 99% confidence interval for u (Use integers or decimals for any number in the expression. ...

*March 23, 2014 by Carol Harper*

**math please help**

The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information: $177,500 $279,900 $...

*December 7, 2014 by LADO*

**Statistics**

A study of 420,048 cell phone users found that 135 of them developed cancer of the brain or nervous system. prior to this study of cell phone use the rate of such cancer was found to be 0.0333% for those not using cell phones. Complete parts (a) and (b) a. use the sample data ...

*April 30, 2013 by Rob*

**Math**

What effect will an outlier have on a confidence interval that is based on a small sample size? A) The interval will be smaller than an interval without the outlier. B) The interval will be the same with or without the outlier. C) The confidence interval will be wider than an ...

*November 28, 2009 by Jennifer*

**statistics**

a companys ceo wanted to estimate the percentage of defective product per shipment. in a sample contianing 600 products he found 45 defective product. a. find 99% confidence interval for the true porporton of defective product show calcultions and explain process used to ...

*August 23, 2011 by crystal*

**planning & implementing for the environment**

Three things that you should consider grouping children in your center are the child's A. chronological age, family type, and socioeconomic status B. chronological age, developmental level, and individual needs. C. developmental level, individual needs, and family type. D. ...

*October 20, 2014 by Amanda*

**AED 204**

Who is most likely to be a part of this socioeconomic class? How do teacher expectations positively or negatively impact this socioeconomic class? How does tracking positively or negatively impact this socioeconomic class? How is financial support for schools serving this ...

*January 18, 2010 by bob*

**AED**

Who is most likely to be a part of this socioeconomic class? How do teacher expectations positively or negatively impact this socioeconomic class? How does tracking positively or negatively impact this socioeconomic class? How is financial support for schools serving this ...

*December 21, 2008 by troyer0269*

**Statistics**

If a 90%, 95% and 99% confidence interval are found for a population mean, how are the three interval estimates related to each other?

*December 7, 2008 by Cecilia*

**statistics**

Lorraine was in a hurry when she computed a confidence interval for μ. Because σ was not known, she used a Student's t distribution. However, she accidentally used degrees of freedom n instead of n - 1. Will her confidence interval be longer or shorter than one found...

*February 18, 2012 by jr*

**Statistics**

. As the sample size increases The confidence interval also increases (gets larger) The confidence interval decreases (gets smaller) The confidence interval stays the same The population mean increases.

*June 22, 2010 by Jacob*

**Business statistics**

You chose a simple random sample of 300 guests you develop a 95 percent confidence interval estimate you found the following 325 and 32 determine the standard error of the sampling distribution determine the critical value z from the standard normal table compute the ...

*August 14, 2016 by Kim*

**Statistics**

Direct mail advertisers send solicitations (a.k.a. "junk mail") to thousands of potential customers in the hope that some will buy the company's product. The response rate is usually quite low. Suppose a company wants to test the response to a new flyer, and sends it to 1000 ...

*March 13, 2013 by MeSue*

**Elementary Statistics**

1) Construct a confidence interval of the population proportion at the given level of confidence. x=60,n=300, 99% confidence. The 99% confidence interval is (_,_) 2) A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample ...

*June 6, 2012 by Erin*

**probs & stats**

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% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...

*May 11, 2015 by adrenning*

**Statistics**

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% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...

*May 9, 2013 by Anonymous*

**Statistics:Significance Test and Confidence Interv**

Significance Test and Confidence Intervals In General: The article contains a 95% confidence interval. Would the margin of error in a 99% confidence interval computed from the same data be less, the same, or greater?

*September 11, 2007 by Carma*

**Statistics**

You are given the following information obtained from a random sample of 6 observations. Assume the population has a normal distribution. 13 14 17 14 17 15 a. What is the point estimate of µ? b. Construct an 80% confidence interval for µ. c. Construct a 98% confidence ...

*November 12, 2013 by Katie*

**stats**

A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution, with a population standard deviation of $4. A sample of 49 customers revealed that the ...

*November 4, 2014 by Anonymous*

**Statistics**

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% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...

*May 3, 2013 by Cam*

**statistics**

The Frayed Nerves Anxiety Scale (FNAS) is used to measure the anxiety level of people on a scale from 0 to 1000. Four students were randomly chosen and given the FNAS before their second exam. Their scores were 700, 653, 740, and 707. The standard deviation sigma of the test ...

*October 17, 2011 by Anand*

**math**

The new Twinkle bulb is being developed to last more than 1000 hours. A random sample of 100 of these new bulbs is selected from the production line. It was found that 48 lasted more than 1000 hours. Find the point estimate for the population proportion, the margin of error ...

*April 17, 2011 by Heaven*

**Statistics**

Suppose x has a mound-shaped distribution with sigma = 9 . A random sample of size 36 has sample mean 20. Is it appropriate to use a normal distribution to compute a confidence interval for the population mean m? Explain. Find a 95% confidence interval for m. Explain the ...

*April 27, 2013 by Steph*

**mba business reserach methods**

Sampling A manufacturing company's quality control personnel have recorded the proportion of defective items for each of 500 monthly shipments of one of the computer components that the company produces. See data below. The company doesn't have time to review all of these. (a...

*March 20, 2011 by Carolina*

**statistics**

Lorraine was in a hurry when she computed a confidence interval for . Because was not known, she used a Student's t distribution. However, she accidentally used degrees of freedom n + 1 instead of n - 1. v Will her confidence interval be longer or shorter than one found using ...

*April 29, 2012 by trina*

**Statistics Question (Confidence Interval)**

A sample of 15 recent college graduates found that starting salaries for attorneys in New York City had a mean of $102,342 and a standard deviation of $21,756. Construct a 95% confidence interval for the average starting salary of all attorneys in the city. A. (89869.82, ...

*March 14, 2012 by Mark*

**statistics**

Consider a 95% confidence interval for a population mean constructed from a random sample of 250 observations taken from a Normal population. Sigma is known to be 14. If we were to construct another 95% confidence interval, this time using 1,000 observations, how would the ...

*February 20, 2011 by AMY*

**statistics**

Consider a 95% confidence interval for a population mean constructed from a random sample of 250 observations taken from a Normal population. Sigma is known to be 14. If we were to construct another 95% confidence interval, this time using 1,000 observations, how would the ...

*February 20, 2011 by AMY*

**Statistics**

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 because I am estimating a population proportion. Am I on the right track? An important issue facing Americans is the large number of medical malpractice ...

*March 25, 2008 by Jim*

**Statistics**

When consumers apply for credit, their credit is rated using the FICO score. A bank manager used a random sample of the credit scores of 18 customers and determined the following 95% confidence interval: (613.6, 708.0) If the sample used 45 customers rather than 18 customers, ...

*November 6, 2013 by Katelyn*

**statistical applications**

In the media, numerous surveys are often displayed reporting percentages or proportions. A margin of error is often reported in the survey and this is used to calculate confidence intervals. Why is it important to create/report confidence intervals (CI) rather than just ...

*May 28, 2010 by cortez*

**Statistics**

Direct mail advertisers send solicitations (that is "junk mail") to thousands of potential customers in the hope that some will buy the company's products. The response rate is usually quite low. Suppose a company wants to test the response rate for a new flyer format. The ...

*October 27, 2013 by Nick*

**math**

Given the information: the sampled population is normally distributed, = 10.4, n = 60, and = 81.2. a. Find the 98% confidence interval for b. Interpret the confidence interval in Where do i begin

*November 17, 2008 by ks*

**stats**

Would a proportion of 60% be likely, given the calculated confidence interval? Yes/No Find Answer to: 80% confidence interval ________+/-___________

*June 24, 2011 by Anonymous*

**statistics**

Consider a 90% confidence interval for μ. Assume σ is not known. For which sample size n=10 or n=20, is the confidence interval longer?

*October 31, 2011 by Morgan*

**UOP**

5) In a 95% Confidence Interval, the true mean has what chance of falling between the Lower Limit and Upper Limits of the calculated confidence interval? A. .90 B. 95% C. .05 D. 5%

*April 13, 2013 by Linda*

**Statistics**

Smoking habit Socioeconomic status High Low Smoking 15 40 55 Not smoking 25 10 35 Total 40 50 N=90 a. For these ordinal variables, which hypothesis testing is appropriate to test the relationship between SES and smoking habits variable? b. Write the HO and H1 c. Perform the ...

*October 14, 2013 by Chris*

**statistics**

The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a ...

*April 21, 2014 by Vanessa*

**statistics (6)**

The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a ...

*April 22, 2014 by Vanessa*

**statistics (6)**

The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a ...

*April 23, 2014 by Vanessa*

**Statistics**

Which of the following statements correctly interprets a 95% confidence interval on a population mean? a. It is a single point estimate b. Used to quantify the certainty of the sample standard deviation c. A 99% confidence interval is narrower than the 95% confidence interval ...

*September 15, 2010 by Beata Chmielewska*

**stats**

The president of a large university wishes to estimate the average age of the students presently enrolled. From past studies, the standard deviation ó is known to be 2 years. A sample of 50 students is selected and the mean is found to be 23.3 years. a. Find the 99% ...

*April 7, 2013 by chris*

**statistics**

10. Using the results of a Newsweek poll conducted in March of 2009, a 90% confidence interval on the proportion of adult Americans who have a favorable opinion of Barack Obama is given by (0.699, 0.741). If everything else is the same, but the confidence level increases, what...

*May 8, 2013 by ali awan*

**Quantitative Methods**

7) President’s job approval rating is frequently reported in news programs. You will hear statements such as: “Among likely voters, the President’s job approval rating is 46% with a margin of error of 6%.” a) What percent confidence interval do you think they are ...

*November 21, 2014 by EJ*

**QNT351**

use a 95% confidence interval to estimate the difference between the population means. Interpret the confidence interval. random sample 390 x1 5258 s1 152 x2 5220 s2 192

*September 27, 2012 by Terri*

**statistics**

P(proportion) is 0.05446, n is 863 and a 90% confidence interval is required. What is this confidence interval?

*December 23, 2011 by blue*

**statistics**

A simple random sample of students is selected, and the students are asked how much time they spent preparing for a test. The times (in hours) are as follows: 1.3 7.2 4.2 12.5 6.6 2.5 5.5 Based on these results, a confidence interval for the population mean is found to be...

*November 30, 2014 by Brian*

**statistics**

Help!!!!!! A confidence interval estimate for the population mean is given to be (39,90, 48.11) If the standard deviation is 11.473 and the sample size is 52 determine the maximum error of the estimate. determine the confidence level used for the given confidence interval

*November 9, 2011 by amy*

**Statistics**

Hoping to lure more shoppers downtown, a city builds a new parking garage in the central business district. The city hopes that the parking revenues will pay for the garage. During a recent two month period (44 days), the city statistician calculated the 95% confidence ...

*November 10, 2013 by Katie*

**statistics**

1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the ...

*July 17, 2010 by Anonymous*

**stat**

7. A researcher selects a random sample. A 90% confidence interval for a population mean A) is an interval with margin of error ± 90%. B) has the property that if we repeatedly selected our random sample in exactly the same way, each time constructing a different 90...

*December 5, 2010 by Anonymous*

**MATH**

The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval with and without the outlier included. Comment on the effect the outlier has on the confidence interval. Here is the information: $162,000 $279,900 $...

*November 30, 2014 by LADO*

**Statistics**

Professor York randomly surveyed 240 students at Oxnard University, and found that 150 of the students surveyed watch more than 10 hours of television weekly. Develop a 95% confidence interval to estimate the true proportion of students who watch more than 10 hours of ...

*April 7, 2014 by Angela*

**Statistics**

Use the sample data and confidence level to construct the confidence interval estimate of the population p....n=5200, x=4821, 99% confidence

*May 1, 2013 by Tangee*

**Statistics**

Should companies use the same confidence interval each time a confidence interval is determined or should the level change based on situations? If it changes based on situations, what type of situations might call for higher confidence levels?

*April 6, 2012 by John*

**Math-Statistics**

Find a confidence interval for ƒÊ assuming that each sample is from a normal population. a. P x = 14, ƒÐ = 4, n = 5, 90 percent confidence b. P x = 37, ƒÐ = 5, n = 15, 99 percent confidence c. P x = 121, ƒÐ = 15, n = 25, 95 percent confidence Need to show my work...

*December 6, 2011 by Richard*

**Algebra 2**

A simple random sample of 90 is drawn from a normally distributed population, and the mean is found to be 138, with a standard deviation of 34. What is the 90% confidence interval for the population mean? Use the table below to help you answer the question. Confidence Level 90...

*December 9, 2014 by Jasmine*

**statistics**

How large a sample would be needed to form a 90% confidence interval for the mean nicotine content of a brand of cigarettes if the nicotine content has a normal distribution with sigma equal to 8.5 mg and the width of the interval (the length of the confidence interval) equal ...

*November 17, 2013 by Alex*

**Statistics**

A simple random sample of 50 female 14-year-olds is selected. The sample mean height of the girls is found to be 62 inches. Assume the height of 14-year-old girls is normally distributed with a standard deviation of 5 inches. 1. Based on these data, a 95% confidence interval ...

*November 27, 2012 by Clay*

**Statistics**

When estimating a population mean μ, where the population standard deviation σ is known, we can: a. choose a larger z value, construct a wider confidence interval, and achieve a lower confidence level b. choose a smaller z value, construct a narrower confidence ...

*November 14, 2012 by Melanie*

**Statistics**

A survey of community banks asked about the loan to deposit ratio (LTDR) a banks total loans as a percent of its total deposits. The mean LTDR for the 110 banks in the sample is xbar = 76.7 and the standard deviation is s = 12.3. In the text a 95% confidence interval (using a ...

*February 26, 2007 by Jason L*

**statistics**

A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the ...

*July 17, 2010 by Anonymous*

**college stats**

Sorry for all the questions, I really need help and an explanation so I can fully understand. I really appreciate everything. Thank you. In a random sample of 519 judges, it was found that 285 had an introvert personality type. Construct a 95% confidence interval for the ...

*July 12, 2013 by penelope*

**statistics**

A sample of n = 9 has a mean of M = 72 with SS = 162. Use the sample to make a point estimate of ì and to construct the 90% confidence interval for ì. (Round all answers to two decimal places ì = ? ± ? ( ? ) The 90% confidence interval for ì: ( ? , ? )

*November 4, 2011 by Anonymous*