Determining sample size to obtain the error

Assignment Help Basic Statistics

Reference no: EM1318604

Q1) Biting unpopped kernel of popcorn hurts! As experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in popper. After popping, unpopped kernels were counted. There were 86.

a) Create a 90% confidence interval for proportion of all kernels that would not pop.

b) Check normality assumption.

c) Try Very Quick Rule. Does it work well here? Describe why, or why not?

d) Why might this sample not be typical?

Q2) A sample of 20 pages was taken with no replacement from 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, mean area devoted to display ads was measured

0	260	356	403	536	0	268	369	428	536
268	396	469	536	162	338	403	536	536	130

a) Create a 95% confidence interval for true mean.

b) Why might normality be the issue here?

c) What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?

d) If this is not a sensible requirement, suggest one that is.

Reference no: EM1318604

Questions Cloud

Personality traits management style and leadership qualities : Describe the personality traits, management style, and leadership qualities that helped him or her lead the company to a successful implementation of new practices.

Creating the unbiased point estimate : Use given data to create the unbiased point estimate of 12Ïƒ'> 2 of percentage of termites that are minor workers.

Current management trends and analysis : Find out the current top five best-selling management books. Read a review of each book and write a short paragraph describing what each book is about.

Discussing the challenges of security : Recognize and discuss one of the challenges of the security and three vulnerabilities that are associated with use of the wireless network.

Determining sample size to obtain the error : What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?

Probability-median of the sample or average medians : A population whose shape is unknown has a median of 75. You selected a sample of 40. The standard deviation of the median is 5. Calculate the probability that the median of the sample or average medians is:

Advantages and disadvantages of end-user computing : Explain the advantages and disadvantages of the end-user computing and determine if this is an application which should be progressively pursued. Describe your rationale.

Determining probability of mutually exclusive events : Determine the following probabilities: Events A and B are mutually exclusive events defined on common sample space.

Median of the sample or average medians : Which is the probability of that the median of the sample or average medians be between 320 and 350 minutes?

User Account

All Pages