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If the sample size (n) is large, and the sample is a random sample, then the distribution of the sample mean x-bar is approximately a:
A) binomial distribution.
B) uniform distribution.
C) normal distribution.
D) none of the above.
Open data file on your excel file AirlinePassengers . Point to the level of data (nominal, ordinal, ratio, or interval) measurement for each variable in data set. Notice tab for description gives information about data.
Assume the arrival of these emails is approximated by the Poisson distribution.
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
Calculate the mean and standard deviation of the sample mean based on data from 100 stores.
Expireall Corporation is in finishing business. The following data took place during September: The standard cost card indicates that 2.0 feet are used in the production of each unit. The standard cost of each material is $4.50 per foot.
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
The 99% confidence interval using a t-distribution is ( ), ( ). Round to one decimal place as needed
Develop a linear regression model for these data and forecast carpet sales if 30 construction permits for new homes are filed.
A random variable has a standard deviation of 16, and an unknown mean. Find the lowest size of a simple random sample so that the sample mean estimates the population mean with a standard error no larger than 0.25.
We wish to construct a 90% confidence interval on the mean of a population known to be normally distributed based on a sample of 20 observations having a sample mean of 8 and a sample standard deviation of 2. What is the standard error?
Calculate a value of lambda using the data from last week concerning the news networks and the reporting practices. Compare your resulting lambda to the resulting chi-square from last week.
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
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