Search
Info
Warning
Danger

Study Resources (Statistics)

    71) As the confidence level for a confidence interval increases, the width of the interval also increases.   72) An unbiased estimator of a population parameter is an estimator whose variance is the same as the actual value of the population variance. 73) The process of inferring the values of unknown population parameters.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Independent random sampling from two normally distributed populations gives the following results: nx = 64, = 441, σx = 20, ny = 36, = 361, and σy = 25   84) Find the margin of error for a 90% confidence interval for.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A Monte Carlo study involves 10,000 random samples of size 20 from a normal population with mean μ = 120 and standard deviation σ = 20. For each sample, the mean and the median are calculated, with the following results:   Estimator Mean Median Average 120.2 119.96 Variance 25.52 67.89   102) What does.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A process producing bricks is known to produce bricks whose weights are normally distributed with a standard deviation of 0.11 lb. A random sample of 16 bricks from today's output had a mean weight of 4.08 lb.   141) Find a 99% confidence interval.
1 Views
View Answer
    31) What is the margin of error at 95% Confidence interval? A) 2.76 B) 1.62 C) 1.25 D) 2.00   32) What is the width of the interval? A) 4.86 B) 2.56 C) 3.24 D) 6.48   33) What is the upper confidence limit of the 95% confidence interval? A) 0.42 B) 1.48 C) 0.043 D) 0.05 34) What is the lower confidence limit of the.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The sales manager for a hardware wholesaler finds that 229 of the previous 500 calls to hardware store owners resulted in new product placements. Assume that the 500 calls represent a random sample.   121) Find a 95% confidence interval for the long-run proportion.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A dependent random sample from two normally distributed populations gives the following results: n = 20; = 14.8;sd = 4.0   106) Find the margin of error for a 99% confidence interval for the difference between the means of the two populations.   107) Find the width.
1 Views
View Answer
    21) The standard deviation of is also called the: A) standard error of the sampling distribution of sample proportions. B) standard deviation of the population. C) normal approximation to the binomial. D) continuity correction factor. 22) If all possible random samples of size n are taken from a population, and the mean of each.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The chairman of the statistics department in a certain college believes that 70% of the department's graduate assistantships are given to international students. A random sample of 50 graduate assistants is taken.   143) Assume that the chairman is correct and P = 0.70..
1 Views
View Answer
    21) Find the upper confidence limit of the 95% confidence interval. A) 95.68 B) 98.07 C) 96.79 D) 94.43   22) Find the lower confidence limit of the 95% confidence interval. A) 83.21 B) 85.57 C) 81.93 D) 84.32 THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A school bus driver records the time (in minutes) it takes to commute to.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: From a random sample of seven students in a marketing research class that uses group-learning techniques, the mean examination score was found to be 78.25 and the sample standard deviation was 2.87. For an independent random sample of ten students in another.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A computer information systems manager was in charge of purchasing new battery packs for laptop computers. The choices were narrowed to two available models. Since the two models cost about the same, the manager was interested in determining whether there was a.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The Daytona Beach Tourism Commission is interested in the average amount of money a typical college student spends per day during spring break. They survey 35 students and find that the mean spending is $63.57 with a standard deviation of $17.32.   108) Develop.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:   = 19.56sd = 2.5 andn = 20   97) Calculate the margin of error for a 95% confidence interval using the given data:   98) Calculate the width of the interval for a 95% confidence interval. THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: =.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A random sample of ten homes in a particular suburb had the following selling prices (in thousands of dollars): 92, 83, 110, 115, 108, 96, 102, 90, 100, and 98. 134) Check for evidence of nonnormality.   135) Find a point estimate of the population.
1 Views
View Answer
    71) For confidence intervals of two means that are dependent samples, the margin of error is equal totn-1,tα/s .   72) The mean of the sampling distribution of the difference between sample proportions, 1 - 2, is equal to the difference between the corresponding population proportions, P1 - P2.   73) Certain situations that.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey of high school students, it was found that the average amount of money spent on entertainment each week was normally distributed with a mean of $52.30 and a standard deviation of $18.23. Assume that these values are representative.
1 Views
View Answer
    81) You are interested in examining the salaries earned by graduate business school students at the end of the first year after graduation. In particular, you are interested in seeing whether there is a difference between men and women graduates' salaries. From a random sample of 55 women, you find.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: From a random sample of 500 registered voters in Los Angeles, 400 indicated that they would vote in favor of a proposed policy in an upcoming election.   145) Calculate a 98% confidence interval estimate for the population proportion in favor of this policy. 146).
1 Views
View Answer
    51) Find a 99% confidence interval for the difference in the amount of power consumed at high voltages by the two models. A) 0.2 ± 0.86 B) 0.2 ± 0.58 C) 0.2 ± 0.64 D) 0.2 ± 0.77   THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Two dependent random samples from two normally distributed populations.
1 Views
View Answer
  THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A career counselor is interested in examining the salaries earned by graduate business school students at the end of the first year after graduation. In particular, the counselor is interested in seeing whether there is a difference between men and women graduates'.
4 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Suppose that the amount of time teenagers spend on the internet is normally distributed with a standard deviation of 1.5 hours. A sample of 100 teenagers is selected at random, and the sample mean is computed as 6.5 hours.   115) Determine the 95%.
1 Views
View Answer
    81) An unbiased estimation procedure for the population total Nμ yields the point estimate N.   82) The sample proportion is a biased estimator of the population proportion P.   83) Whatever the value of the sample proportion, (1 - ) cannot be smaller than 0.25.   84) The maximum distance between an estimator and.
2 Views
View Answer
    21) What is the lower confidence limit of the 98% confidence interval for the difference in population proportions? A) -0.125 B) 0.135 C) -0.147 D) 0.147   THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In calculating the 95% confidence interval for μ1 - μ2 the difference between the means of two normally distributed populations, the.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A researcher is interested in determining the percentage of all households in the U.S. that have more than one home computer. In a survey of 492 households, 27% indicated that they own more than one home computer.   111) Develop a 90% confidence interval.
1 Views
View Answer
    61) Determine the number of degrees of freedom. A) 18 B) 16 C) 20 D) 9   62) Find the 98% confidence interval for the difference in the mean costs of parking tickets in these two cities. A) 19.52 ± 25.37 B) 19.52 ± 20.38 C) 19.52 ± 22.77 D) 19.52 ± 22.21 THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING.
1 Views
View Answer
    31) Interval estimates for the variance of a normal population rely on the random variable (n - 1)s2 / σ2, which follows: A) a normal distribution. B) a binomial distribution. C) the Poisson distribution. D) a chi-square distribution. 32) If a sample of size 200 has 40 successes, the lower limit of a confidence interval.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A regional CPA firm conducted an audit for a discount chain. One part of the audit involved developing an estimate for the mean dollar error in total charges that occur during the checkout process. They wish to develop a 90% confidence interval.
1 Views
View Answer
THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: The following data give the number of pets owned for a population of 4 families.   Family A B C D Number of Pets Owned 2 1 4 3   139) Find the population mean and population standard deviation. 140) Samples of size 2 will be drawn at random from the population. Use the formulas .
1 Views
View Answer
    11) The standard deviation of the sampling distribution of the sample mean is also called the: A) minimum sample factor. B) standard error of the mean. C) finite population correction factor. D) population standard deviation.   12) If all possible samples of size n are drawn from an infinite population with a mean of 20 and.
1 Views
View Answer