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We would like to estimate the true mean amount of time (in minutes) Canadian teenagers spend on the internet per day. The population standard deviation of daily internet usage time is known to be 55 minutes.(a) What sample size is required in order to estimate to within 15 minutes with 90% confidence? (b) What sample size is required in order to estimate to within 5 minutes with 90% confidence? (c) For a fixed confidence level, when we decrease the desired margin of error to one third its original value, how many times larger a sample size will be require?(d) What sample size is required in order to estimate to within 15 minutes with 98% confidence? (e) For a fixed margin of error, when we increase the desired confidence level, what happens to the required sample size? (increase, decrease or remain the same).(f) The United States has ten times the population of Canada. Assuming equal standard deviations, how many American teenagers must be sampled in order to estimate the true mean amount of time American teenagers spend on the internet per day to within 15 minutes with 90% confidence?
Polychlorinated biphenyl (PCB) is among a group of organic pollutants found in a variety of products, such as coolants, insulating materials, and lubricants in electrical equipment. Disposal of items containing less than 50 parts per million (ppm) PC..
11. Let A be an event that a person's primary method of transportation to and from work is an automobile and B be an event that a person's primary method of transportation to and from work is a bus. Suppose that in a large cityP(A) = 0.45 and P(B) = ..
Write the null hypothesis in mathematical form; and in plain English. Write the alternative hypothesis in mathematical form; and in plain English. State the model assumption(s) and assess them.
Critical Thinking
question 1a the x and y components of fluid velocity in a two-dimensional flow field are ux and v -y respectivelyi
The number of gallons of paint that Home Depot sells in a given day is normally distributed with a mean of 160 gallons and a standard deviation of 55 gallons (I realize that the distribution is probably different for weekends compared to weekdays, bu..
Which of the following is NOT a point estimate?
Use the Excel Analysis ToolPak to find the linear correlation coefficient for the systolic and diastolic measurements.
The Diameter of a brand of ping pong balls is approximatley normally distributed with the mean of 1.31 inches and the standard deviation of 0.04 inch a random sample of 16 ping pong balls is selected A) what is the probablility that the sample mean i..
1) The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered. Use exponential smoothing with a smoothing constant of .8 to forecast attendance for the eighth year. 75, 78, 75, 120, ..
Suppose a gun sprays paint in a uniform back-and-forth movement, covering an angular sweep between forty five degrees to either side, onto a screen 100cm away. Assume that the distribution of paint at a distance ±x to either side of the centre of the..
An RCMP officer would like to estimate the true mean speed of all vehicles along a particular stretch of highway. She measures the speeds of a simple random sample of 40 vehicles and calculates a mean speed of 114.55 km/h. The population stan..
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