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Dilbert is in charge of evaluating a new machine that manufactures shoelaces. In particular, he needs to estimate the percentage of defective shoelaces (a defective shoelace can be frayed, too short, or too long). Good machines are expected to produce no more than 1% defective products. After he evaluates 540 shoelaces, and finds that 17 are defective.
A) If Dilbert has to report a confidence interval with a margin of error equal to 1.5%, how many shoelaces should he evaluate?
B) Given the sample taht he took (in other words, do not use your answer from part A), construct BOTH a plus-four confidence interval AND a large-sample confidence interval. Which do you think it more appropriate in this particular case? Why? Note: you do not need to interpret your intervals
C) Evaluate whether the sample gives sufficient evidence to conclude that the defective rate of the machine is greater than 1%.
What is the logic behind using the sum of the products of deviation scores as the numerator of the formula for the correlation coefficient? Is this logic sound?
Use a .05 significance level to test claims that quarters manufactured with the new equipment have weights with a standard deviation less than .061
atp is sold by genetech that can be used as an anti clotting agent for heart attacks. it is very expensie and not 100
The following data represent the cost of electricity for the period of July 2008 for a random sample of 50 one-bedroom apartments in a large city.
is fishing better from a boat or from the shore? pyramid lake is in nevada. presidents movie stars and people who just
A demonstration to verify that an item meets its reliability requirement is based on obtaining 5 successful tests. If the probability of a successful test is 0.9, find the probability that 10 tests will be required to pass the demonstration.
An office manager wishes to estimate the mean time required to handle customer complaints. A sample of 38 complaints shows a mean time of 28.7 minutes with a standard deviation of 12 minutes.
Which of the t-test methods are you going to use and why? Formulate the null and alternative hypothesis. Determine the criterion for rejection or nonrejection of the null. What is the t-statistic for this analysis
two parts are assembled. the distributions of x1 and x2 are normal with micro1 20 s1 0.3 and micro2 19.6 s2 0.4.
If you assume returns follow a normal distribution, which investment would give a better chance of getting at least a $40 million return? Explain how your answer could change if you knew returns followed a skewed distribution instead of a normal d..
Think about a density curve that consists of two line segments. The first goes from the point (0, 1) to the point (0.7, 1). The second goes from (0.7, 1) to (0.9, 2) in the xy-plane. What percent of observations fall below 0.70?
the average life expectancy in the united states l has been rising steadily over the past few decades as shown in the
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