Business and economics-confidence intervals

Assignment Help Basic Statistics

Reference no: EM13105258

A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square millimeters) are shown below:

0 260 356 403 536 0 268 369 428 536

268 396 469 536 162 338 403 536 536 130

(a) Construct a 95 percent confidence interval for the true mean.

(b) Why might normality be an issue here?

(d) If this is not a reasonable requirement, suggest one that is. (Data are from a project by MBA student Daniel R. Dalach.)

Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kernels were counted. There were 86.

(a) Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.

(b) Check the normality assumption.

(d) Why might this sample not be typical?

Reference no: EM13105258

Questions Cloud

Calculate the speed of the protons at infinity : Use conservation of energy to calculate the speed of the alpha particle at infinity. m/s (e) If the two protons are released from rest and the alpha particle remains fixed, calculate the speed of the protons at infinity. m/s

Illustrate what is the minimum range sample : Assuming that s = 0.15% cannot be reduced and a sample size of n = 64, illustrate what is the minimum range within which the sample average failure rate must be found to justify with 95% confidence the advertised failure rate of 0.5%?

Estimation of evpi : The following is a payoff table giving profits for various situations. The probabilities for states of nature A, B, and C are 0.3, 0.5, and 0.2, respectively.

Estimate the true proportion of home owners : How large a sampl.e is needed to estimate the true proportion of home owners who have vegetable gardens to within 4 percentage points with 95% confidence?

Business and economics-confidence intervals : A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page

Find the acceleration of the aircraft : Find the acceleration of the aircraft and express it in multiples of g, free fall acceleration.

Find total electric potential at point having coordinates : Two point charges are on the y-axis. A 6.0 µC charge is located at y = 1.35 cm, and a -2.20 µC charge is located at y = -1.00 cm. (a) Find the total electric potential at the origin. (b) Find the total electric potential at the point having coordi..

Limit for the population proportion of mice : In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 second or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 second or less.

Evaluate confidence interval : Compute the 99% confidence interval based on four data points that have a sample mean of 71.5 and a sample standard deviation of 16.6032

User Account

All Pages