When a 95% confidence interval is calculated instead of a 90% confiden..
When a 95% confidence interval is calculated instead of a 90% confidence interval with the same sample, the maximum error of estimate will be _____ . => either smaller or larger depending on sample size or the same or smaller or larger..
The number of miles per hour driven by a sales person on 14 different ..
The number of miles per hour driven by a sales person on 14 different days is listed here. What is the point estimate for the mean? Find the 95% confidence interval of the mean for the average miles per hour. => 32.3 and 29.5 < μ < 35.1 or 31.5 and 31 < &mu..
A recent study of 50 people in a city found that 70% of the people hav..
A recent study of 50 people in a city found that 70% of the people have less than average incomes for the city. How many people should be surveyed to estimate the true proportion of people having an income of less than average with a 99% confidence interval 4% wide? =>..
An athlete wishes to estimate the mean number of miles run by him per ..
An athlete wishes to estimate the mean number of miles run by him per day during practice session. The number of miles run by him on 7 days selected randomly is 7.2, 7, 7.5, 7.8, 7.6, 8 and 7.5. Based on the sample mean, what is the point estimate of the mean? Find the 95% ..
The rainfall readings (in millimeters) of 9 cities are listed here. Ba..
The rainfall readings (in millimeters) of 9 cities are listed here. Based on the sample, what is the point estimate of the mean? Find the 90% confidence interval of the population. 2.0, 2.8, 3.1, 4.4, 3.9, 2.6, 5.4, 4.7, 5.2 => 3.79 and 2.87 < μ < 4.71 or 3.9 ..
The university authorities wanted to estimate the average age of the s..
The university authorities wanted to estimate the average age of the students in their university by taking a random sample of 25 students. The standard deviation was found to be 3 years. Find the 95% confidence interval for the variance (σ 2 ) and standard devia..
The manager of a company wishes to estimate the average age of the pre..
The manager of a company wishes to estimate the average age of the present employees. From the past records, the standard deviation is found to be 8 years. A sample of 100 employees are selected and the mean is found to be 42.8 years. Find the 99% confidence interval o..
The formula for the confidence interval for a standard deviation is __..
The formula for the confidence interval for a standard deviation is ________ . => III or II or IV or I..
A teacher wishes to estimate the average weight of 10 students of grad..
A teacher wishes to estimate the average weight of 10 students of grade 6 taken randomly. The weight(in pounds) of the students are shown. Find the 99% confidence interval for the variance for the weights of students. Assume that the variable is normally distributed. 9..
A food technologist wishes to estimate the effects of chicken's diet o..
A food technologist wishes to estimate the effects of chicken's diet on the cholestrol content of the yolks of the resulting eggs. She has selected a random of 350 eggs from chickens, which were given the standard diet and found that the cholestrol content in the yolks of 280 eggs to be 1..
See what our Users say :
She should be the head of Tutor Vista. She knows how to treat her students. Her teaching style is spectacular.
This Tutor Vista is GREAT! loved this session, it helped me heaps.
It was a great pleasure working with this tutor was able to take me through the steps of my math problems which was very helpful because since I don't have lots of experience with math by the tutor doing the steps it helps me understand a great deal. Im so excited that Im finally getting this amazing service. We got so much done. thank you.
I think the tutors knew their stuff really well and was very helpful. math was actually something I dread.not anymore ,Thank you Tutor Vista - jennifer,New york
Looking for More Help!
