(a) What is the planning value for the population standard deviation? (c) At 95% The U.S....
When planning to construct a 95% confidence interval for a population mean such that it is within one eighth (population) standard deviation from a sample mean, what is the minimum sample size required?
In a large population of prisoners, the mean IQ is 95 with a standard deviation of 15. 250 adults from this population are randomly selected for a survey of attitudes toward crime. a. What is the mean of this sampling distribution (all samples of n = 250)? b. What is the standard deviation of the sampling distribution? c. What is the shape of sampling distribution? d. If an individual prisoner has an IQ of 90, is she a likely or...
Construct a 95% confidence interval for the population standard deviation sigma of a random sample of 15 men who have a mean weight of 165.2 pounds with a standard deviation of 12.5 pounds. Assume the population is normally distributed.
Construct a 95% confidence interval for the population standard deviation o of a random sample of 15 men who have a mean weight of 165.2 pounds with a standard deviation of 13.5 pounds. Assume the population is normally distributed.
Construct a 95% confidence interval for the population standard deviation σ of a random sample of 15 crates which have a mean weight of 165.2 pounds and a standard deviation of 12.9 pounds. Assume the population is normally distributed
the population standard deviation is 6.84 days, assuming a 95% confidence, what sample size would be required to obtain a margin of error of 2 days? (Remember to round up to the nearest whole number for sample size.)
Refer to the Scheer Industries example in Section 8.2. Use 6.87 days as a planning value for the population standard deviation. a. Assuming 95% confidence, what sample size would be required to obtain a margin of error of 1.5 days (round up to the next whole number)? b. Assuming 90% confidence, what sample size would be required to obtain a margin of error of 2 days (round up to the next whole number)?
I. Construct a 95% confidence interval for the population standard deviation sigmaơ of a random sample of 15 men who have a mean weight of 165.2 pounds with a standard deviation of 10.9 (10.1 or 14.3) pounds. Assume the population is normally distributed.
one can calculate the 95% confidence interval for the mean with the population standard deviation knowing this gives us an upper and lower confidence limit what happens if we decide to calculate the 99% confidence interval describe how the increase in the confidence level has changed the width of the confidence interval the same for the confidence interval set at 80% including example with actual numeric value for the intervals and you're supposed to help with your explanations
Keep in mind it says population standard deviation is 11.9 so it should be a Standard normal using Z tables and not T? 2. The Edison Electric Institute has published figures on the number of kilowatt hours used annually by various home appliances. It is claimed that a vacuum cleaner uses an average of 46 kilowatt hours per year. A random sample of 12 homes included in a planned study indicates that vacuum cleaners use an average of 42 kilowatt...