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A quality control supervisor has taken a sample of 16 bolts from the output of a thread-cutting machine and tested their tensile strengths. The results, in tons of force required for breakage, are as follows:
2.20 2.15 1.85 2.231.98 2.24 1.96 2.271.95 2.08 1.92 2.192.07 2.31 2.30 1.89
a) Determine the mean, median, range, and midrange.b) Calculate the mean absolute deviation (MAD).c) Calculate the standard deviation and variance
Decileter and standard deviation of 41 mg/dl. in an srs of 100 men what is the probability that x bar takes a value between 185 and 191 mg/dl?
A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n = 9 students is obtained and each student is given the normal dose of the medicine.
Complete the ANOVA table. Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
A college's data about incoming freshmen indicates that the mean of their high school GPA was 3.4, with a standard deviation of 0.35. Let X=the GPA of an incoming freshman. The students are randomly assigned to writing groups of size 49.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. Check the normality assumption.
Use the expected collision payment to determine the collision insurance premium that would enable the company to break even on the policy.
Using given data table, find out midpoint for class with greatest frequency?
What are the relevant hypotheses? Perform an appropriate parametric statistical procedure to test these hypotheses and briefly explain your results (a level = 0.05).
Explain why random samples are preferred to nonrandom samples.
In a random sample of 225 students at a university, 180 stated that they were nonsmokers. Based on this sample, compute a 95% confidence interval for the proportion of all students at the university who are nonsmokers.
Sketch and upload the density function for the random variable Y. Be sure to label your axes and provide values on the axes.
Find the standard deviation and variance from the (population) data below. Describe your results.
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