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Twenty randomly sampled people were asked to dial thirty telephone numbers each. The incidences of numbers misdialed by these people is as follow:
3 2 0 0 1 5 7 8 2 60 1 2 7 2 5 1 4 5 3
Enter the data and use the appropriate commands to find the mean, median, mode, sample standard deviation, population standard deviation, 10% trimmed mean, and data count.
Following data from an x bar chart, is the process capable (capability index>1.33)?
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
At the .05 significance level, is there a difference in the mean number of calls per day between the two employees?
Discuss possible study designs. Which of the designs would we use to test our research hypothesis?
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
The average age of the students in the sample was 23 with a standard deviation of 3.5: a) Formulate the hypotheses for this problem.
Calculate the expected value and standard deviation of the value.
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
Run an ANOVA using only groups 1 to 6 (You can hide group 7 from the analysis by data followed by select cases and then you filter out group 7 by if GROUP~= ). Also run the posthoc tests LSD and Bonferroni.
What is the probability that the sum of their scores exceeds 1200 and probability that the average of the scores of all 400 student
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