Questions and answers by

ali awan

Questions (22)

A study performed by Bridge Ratings found that in 2006, 58% of respondents said they use a cell phone while traveling in a
1. 0 answers
2. 580 views
The distribution of heights of American women aged 18 to 24 is approximately normally distributed with mean 65.5 inches and
1. 0 answers
2. 1,105 views
According to a USA Today poll conducted in February 2009, 83% of adults nationwide are in favor of funding new government
1. 0 answers
2. 890 views
A study involving the economic burden of congestive heart failure found that the lengths of hospital stays for patients had a
1. 0 answers
2. 579 views
According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over
1. 0 answers
2. 1,270 views
Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2°F and a standard deviation of
1. 0 answers
2. 994 views
12.Suppose we are estimating p and we have no prior estimate of p. Find the required sample size for a confidence level of 90%
1. 1 answer
2. 478 views
11.Suppose we are estimating m. What happens to the required sample size as the population standard deviation increases while
1. 0 answers
2. 589 views
10.Using the results of a Newsweek poll conducted in March of 2009, a 90% confidence interval on the proportion of adult
1. 1 answer
2. 464 views
Using the results of a Newsweek poll conducted in March of 2009, a 90% confidence interval on the proportion of adult Americans
1. 0 answers
2. 391 views
According to a Gallup Poll conducted in March of 2009, 38% of American adults polled believe that global warming will pose a
1. 0 answers
2. 792 views
7.Determine whether it is appropriate to apply the Central Limit Theorem for Proportions: sample size 35, sample proportion
1. 3 answers
2. 738 views
6.Which distribution has the larger mean? i) t distribution, (df = 30) ii) standard normal distribution A) i) B) ii) C) They are
1. 0 answers
2. 414 views
5.What happens to the width of our confidence interval for m if we increase the sample size but keep the confidence level the
1. 0 answers
2. 592 views
4.The Pew Research Center reported that 57% of Americans favored the Wall Street bailout of 2008. A random sample of 300 people
1. 0 answers
2. 496 views
The National Coalition on Healthcare suggests that the mean annual premium that a health insurer charges an employer for a
1. 0 answers
2. 1,066 views
2.We would like to test whether the population mean is less than 40. Suppose that a hypothesis test is conducted to determine if
1. 0 answers
2. 503 views
According to CreditReport, the mean credit score in Georgia for 2007 was 668. Suppose that a hypothesis test is conducted to
1. 0 answers
2. 500 views
Find the value of Z that is smaller than 90% of all values of Z.
1. 1 answer
2. 1,113 views
Participants from the National Health and Nutrition Examination Survey, 2003–2004, had a mean BMI of 28.3 with a standard
1. 2 answers
2. 1,808 views
According to the Census Bureau's 2002 American Community Survey, the average travel time to work of workers 16 years and over
1. 0 answers
2. 696 views
Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2°F and a standard deviation of
1. 1 answer
2. 796 views