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Quality Control specialists design a study aimed at estimating the average assembly time for a new device. They assume that individual records are independent normally distributed with population standard deviation = σ = 2.5 minutes. Find the smallest sample size = n, such that the 95% confidence interval for the population mean = µ is no wider than 1 minute. 1. Show the critical value for design of this study 2. Indicate the formula used in this case and show the smallest sample size needed.
Bureau of Labor Statistics experts design a study aimed at estimating the unknown proportion = p of self-employed programmers. They intend to use confidence level = C = 0.90 and want to have the margin of error bounded by B = 2%. Find the smallest sample size n that will be required for this study. 1. Show the critical value needed for the study 2. Indicate which formula you use in this case and show the smallest sample size needed.
1. What is the market penetration rate based on potential customers? 2. What is Allison's unit market share (based on stalls cleaned)?
Exponential smoothing is meant to be used with time-series data when the data are made up of some or all of the basic components of average, trend, seasonality.
361 college students recorded the number of hours of tv they watched per week. the average is 6.504 hours with the
Problem: The number of tickets purchased by an individual for Beckham College's holiday music festival is a uniformly distributed random variable ranging from 4
a researcher obtains data for witchxbar1nbsp16.63 s1nbsp1.42 n112xbar2nbsp17.93 s2nbsp3.16 n2181 control group2
a random sample of 45 door-to-door encyclopedia salespersons were asked how long on average they were able to talk to
MAS183 - Statistical Data Analysis - Murdoch University - Identify any outliers in the distribution of body weights by stating their Case numbers
Given the following frequency distribution, find the mean, variance, and standard deviation. Please show all of your work so I can see how to do this for the future. This one is good example of what I can do in future for real estate.
The final grades for a random sample of MKT 380 students are as follows: What is the standard deviation for these data?
A survey of 100 students at new england college showed the following:7 take english,history and language, 17 take english and history,15 take english and language,18 take history and language, how many students take history but neither of the othe..
Assume that waiting times are approximately normally distributed. Construct a 98% confidence interval for the population mean of waiting times.
What's the probability the newspaper's sample will lead them to predict defeat? Be sure to verify that the assumptions and conditions necessary for your analysis are met.
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