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In a shipment of steel bars, 2 out of every 100 sets are defective. A construction company makes a purchase of 500 bars selected at random from the manufacturer's production. If x is the number of defective bars purchased by the company,
(a) identify the probability distribution of x and
(b) find the probability that 10 bars are defective.
the following regression model has been computed based on a sample of twenty observations 34.2 19.3x. the first
(a) Plot the GDP time series graphically. (b) Calculate the least squares trendline for GDP. (c) Use this equation to predict the country's GDP for 2012 and 2013.
The original requirements of the sample. Explain the trade-offs that will occur when you lower the sample to $10,000 to meet the budget.
Assume that a distribution of data is normally distributed. For a sample size n = 7, by using a sample mean, which distribution would you employ (t or Z) to make an inference about a population?
If the sample size (n) is large, and the sample is a random sample, then the distribution of the sample mean x-bar is approximately a:
Data collection instrument used in managerial research. Why is it significant to make sure that these data collection methods and instruments are both reliable and valid?
We will select a random sample of 8 cigarettes and conduct a hypothesis test at the 10 % level of significance to determine whether the true mean nicotine content of all cigarettes differs from 8.4 mg.
At the 0.05 level of significance, is there evidence that the mean amount in the bottles is different from 2.0 liters? Compute the ¬p-value and interpret its meaning.
Describe the steps necessary to calculate the theoretical probability of:
Assume the distribution of ages of homes follow an approximately normal distribution. Show all the seven steps and include the p-value.
As you know, the percentile for a value is a measure of where that value stands with respect to the rest of the data. As a criterion for college admissions, why would many schools use a percentile value for a standardized test, rather than a raw s..
Suppose that 55 percent of the people in a population of 500,000 support your candidate. If you conduct a poll of 1,000 people, what is the interval that has a 95 percent chance of containing the results of your poll?
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