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A random sample of 400 observations produced a sample proportion of 0.32. What is the standard error to construct a 99.5% confidence interval.
Use simple exponential smoothing with α = 0.33 to forecast battery sales for February through May. Assume that the forecast for January was for 22 set of tires.
Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
Probability values based on normal distribution - old exit exam followed a normal distribution
Now suppose that a finished product is randomly selected. What is the probability that it is defective?
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
The sampling distribution of mean score is approximately Normal. It has mean. What is its standard deviation?
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Construct the 90% and 99% confidence interval for population mean. Which interval is wider? If convenient, utilize technology to construct confidence intervals.
Mean = 14.2, s² = 5.92 and sum of X squared EX² = 2941.60. What can be concluded about age differences in problem solving ability?
There were 3 defectives in the first batch and 5 in the second. Find a 95% confidence interval for the difference in the proportion of defectives.
If random samples, each with n = 4 scores, are selected from a normal population with MK = 80 and o=10
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