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A consumer advocacy group wants to determine whether there is a difference between proportions of the two leading automobile models that need major repairs within 2 years of purchase. A sample of 400 two-year owners of model 1 is contacted, and a sample of 500 two-year owners of model 2 is contacted. The numbers X1 and X2 of owners who report that their cars needed major repairs within the first two years are 53 and 78, respectively. Test the null hypothesis that no difference exists between the proportions in population 1 and 2 needing major repairs against the alternative that a difference does exist. Use α = 0.10
Use a simple regression model to test the null hypothesis against the alternative
a building is designed to resist loading from earthquakes. the capacity in terms of force factor is assumed to follow a
What is the appropriate t-test to conduct and should the null hypothesis be rejected
tire pressure in a certain car is a normally distributed random variable with mean 30 psi pounds per square inch and
Use the given date to find the minimum sample size required to estimate a population proportion and populat mean. Margin of error: 0.004, confidence level, 90%, sample proportion (p) : = 0.45
1.The demand for Carolina Industries product varies greatly from month to month. Based on the past two years of data, the following probability distribution shows the company's monthly demand:
These two questions belong to Basic Statistics. The first question discuss about hours of sleep and reported tiredness being positively related. The second question is about scatter plot data graphs following two quadrants of Cartesian coordinate ..
How would you approach identifying the two correct time series in #1 to the proceed to merge them into one and make a weekly estimate of attendance?
When sampling is done for the proportion of defective items in a large shipment, where the population proportion is 0.18 and the sample size is 200, what is the probability that the sample proportion will be at least 0.20?
a food inspector examamining 12 jars of a certain brand of peanut butter obtained the following percentages of
if 30 claims are selected, find the probability that 15 will contain 0 errors, 8 will contain 1 error, 5 will contain two errors and 2 will contain 3 errors.
At the 0.01 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 49 months? Perform a two-tailed test.
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