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Based on the information compute the confidence interval using the t-distribution
1. A tire manufacturer wishes to investigate the tread life of its tires. A sample of 20 tires driven 60,000 miles revealed a sample mean of .28 inch of tread remaining with a standard deviation of 0.08. Construct a 95% confidence interval.
2. A consumer group would like to estimate the mean monthly electricity charge for a single family house in July within $5 using a 99% level of confidence. Based on similar studies the standard deviation is estimated to be $20. How large a sample is required?
3.The American Kennel Club wanted to estimate the proportion of children that have a dog as a pet. If the club wanted the estimate to be within 3% of the population proportion, how many children would they need to contact? Assume a 95% level of confidence and that the club estimated that 30% of the children have a dog as a pet.
Show your work please.
a motor bike battery manufacturer found that the life of their batteries is normally distributed with a mean life span
sixty people will board a regional jet. the mean weight of the population is 150 pounds with a standard deviation of 30
Using α = .05 test for significance differences among the population mean wasted time for theses three urban areas. What is the p-value? What is your conclusion?
Find a 98% confidence interval for the mean number of days required for successful completion of physical therapy for patients in the average group. Discuss the results.
Your consulting company has been hired by an airline to analyze data on passenger and luggage weights. The data refer to a 200 seat aircraft that is always full. You are given data that show that as a good approximation passenger weights W ~ N (150, ..
Results from survey of 1000 respondents, point out that 545 favour the dealth penalty for capital crimes. By using a90% confidence level. Create confidence interval estimate for population proportion.
The bin with replacement, find the probability that all the bulbs selected are good ones. Round to the nearest thousandth if necessary.
a sample of data on daily prices of three petrol stations over a two week period have been collected in the table
using the traditional formula a 95 ci for p1 - p2 is to be constructed based on equal sample sizes from the two
Determine the probability of having more than 3 defects in a roll?
The proportion of adults in the sample, as her estimate of p, the proportion of adults in the pond population. Find using the normal approximation with the continuity correction.
The Gallup Poll has decided to increase the size of its random sample of Canadian voters from about 1500 people to 4000 people. The effect of this increase is: increase the standard error of the estimate.
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