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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 sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes.
The heights of 10 sixth graders are listed in inches: {54, 62, 54, 57, 60, 61, 53, 63, 59, 56}. Find the mean, median, mode, sample variance, and range.
consider a random sample of size n from a bernoulli distribution xi bin1p. for a uniform prior density p unif01 and
If the (x, z) points are plotted in a graph, can this graph be used to determine whether the sample comes from a normally distributed population? Explain.
the mean score on a physical fitness test for division i student-athletes is 947 with a standard deviation of 205. if
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
What is the basic principle that can be used to simplify a polynomial? What is the relevance of the order of operations in simplifying a polynomial?
Find a peer-reviewed article that provides an example of a study where the researchers utilized a one sample chi-square OR a two sample chi-square. Briefly describe the study and discuss its findings in your own words.
1. if an accumulator using a dead weight ballast against an initial gas volume of 1500 in3 is heated from 80degf to
Thus, the first question he examines is as follows: Is there a difference in the number of points students earned on their educational statistics pretests and posttests?
Do not include complex models which receive less support from the data than their simpler counterparts. How do we find the models to include in this subset?
question 1 what is a chi-squared test? provide a fully referenced explanation.question 2 provide a brief example on a
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