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A study was done on the propagation of an ultrasonic stress wave through a substance. In particular, attenuation in fiber-glass-reinforced polyester composites was measured. A random sample is 2.6, 2.5, 2.2, 2.0, 2.1, 2.3, and 2.6.
A) Construct a 90% confidence interval for the true mean attenuation values.
B) Find the sample size required to estimate the true mean attenuation values to within + or - 0.05 using a 90% confidence interval.
At the end of class, our teacher said "If you're perceptive, you may have noticed that a regression analysis produced by the Excel Data Analysis ToolPak contains an ANOVA table.
Which of the following scenarios would lead to the most accurate estimate of the amount of parking fees collected during the week?
He can award a bonus to 20 percent of the representatives. What is the cutoff point between those who earn a bonus and those who do not?
question following are the scores on a teacher certification test administered prior to hiring x and the principals
How should he go about taking samples to gather data for testing the hypotheses?
Carbon monoxide emissions for a certain kind of cary vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. A company has 80 of these cars. Estimate the probability that the mean CO level is between 3.0 and 3.1 gm/mi.
Suppose a fast food restaurant wishes to estimate average sales volume for a new menu item. The restaurant has analyzed the sales of the item at a similar outlet and observed the following results:
What was the research question for the systematic review summarised in this Extract and what are the study factor and the primary outcome factor?
an offspring of a grey cat is grey with probability 0.6 and white with probability 0.4. an offspring of a white cat is
the mean wage of people living in alto canillas is said to be pound400 a week with a standard deviation of pound100. a
Find the minimum sample size needed , using a prior study that found that 26% of the respondants said they planned to travel outside the US in next 12months.
given ten students four of which are females if two students are selected at random without replacement what is the
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