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A control chart for thickness of rolled-steel sheets is based on an upper control limit of .0520 in. and a lower limit of .0475 in. The first ten values of the quality statistic (in this case X, the sample mean thickness of n = 5 sample sheets) are .0506, .0493, .0502, .0501, .0512, .0498, .0485, .0500, .0505, and .0483. Construct the initial part of the quality control chart, and comment on its appearance.
If a time series is stationary without a linear trend or the seasonal component, which of the following forecasting methods may be suitable.
forty percent of the students who enroll in a statistics course go to the statistics laboratory on a regular basis.
a sample of 55 night-school students ages is obtained in order to estimate the mean age of night-school students. x 25
For a sample with n=36, the mean duration of a geyser is 3.55 minutes and the standard deviation is 0.63 mintues. Using chebychev's theory, determine at how many of the eruptions lasted between 2.29 and 4.81 mintues.
An efficiency expert wants to determine whether the time an assembly worker requires to perform a standard task might be related to (1) the number of years on the job and (2) the score on a pre-employment aptitude test. The following data have bee..
a set of 10 data values has a mean and median of 1425 and ranges from a minimum value of 987 to a maximum value of
What is the mean of the distribution of sample means with a sample size - what percentage of sample means are greater than 7.7 hours?
Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as?
This problem related to Basic Statistics and it discuss about the key benefits of using qualitative research approach in organizations. An example has been illustrated to support the argument
1. ten employees at a company picnic are to stand in a row for a group photograph. in how many ways can this be done
one environmental group did a study of recycling habits in a california community. it found that 71 of the aluminum
School bullying is a form of aggressive behavior that occurs when a student is exposed repeatedly to negative actions from another student. Give a point estimate for the proportion of boys who claimed they have never bullied another student
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