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A manufacturer of coil springs is interested in implementing a quality control system to monitor his production process. As part of this quality system, it is decided to record the number of nonconforming coil springs in each production batch of size 50. During 40 days of production, 40 batches of data were collected as follows:
Read data across.
(a) Construct a stem-and-leaf plot of the data.
(b) Find the sample average and standard deviation.
(c) Construct a time series plot of the data. Is there evidence that there was an increase or decrease in the average number of nonconforming springs made during the 40 days? Explain.
A drama fan has taped 9 episodes (on nine different videotapes)of a drama. however, he only has time to watch four episodes. suppose he selects four tapes at random. How many different ordered arrangements of episodes are possible?
a manufacturer of snow chain is considering building a new production plant to cope with growing demand. a tyre firm
If the population is normally distributed then the sample mean is also normally distributed even for small sample size.
an investigation of the effectiveness of a training program to improve customer relationships included a pre-training
reconsider the previous problem about the age of a college students mother when the student was born. now suppose you
Construct a table the average number of patients - A variable that reflects the inter-arrival times of patients.
For random samples of size n = 25 selected from a normal distribution with a mean of m = 50 and a standard deviation of s =20, find each of the following: The range of sample means that defines the middle 95% of the distribution of sample means.
Construct the two fold association table and calculate the coefficient of association - number of passed candidates exceeded the number of failed candidates by 310. Boys failing in the examination numbered 88.
What is the importance of a clearly stated hypothesis in research? What harm might an ambiguous hypothesis do? Use an example to illustrate your answer.
Compute the approximate jp-value associated with the test statistic. Does the sample data support the null hypothesis at the a- 0.05 level?
The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours to erect the Red Barn model.
The prices recorded were $1.36, $1.37, $1.38, $1.39, and $1.40. What is the range, mean price, and the standard deviation of the gasoline?
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