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We would like to find the probability of 34 or more successes using the normal distribution to approximate the binomial. Applying the continuity correction factor, what z-score should be used?
Management is considering placing a new hire in an upper-level management position if the person scores in the upper sixth percent of the distribution. What is the lowest score a new hire must earn
In an illustration of normal probabilty distribution a shaded are represents what?
A clinical trial was conducted to test the effectiveness of the drug zipiclone for treating insomnia in older subjects. Before treatment with zipiclone, 16 subjects had a mean wake up time of 102.8
We know many types of data fall into a normal distribution with most of the observations falling toward the middle. However, sometimes data are outliers or data that are very different - larger or s
Create a 95% confidence interval for the difference between proportions of partners who became infected with HIV.
A sample of 81 account balance of a credit company showed and average balance of $1,200 with a standard deviation of $126. You want to determine if the mean of all account balances is significantly
Among 18 patients with depression, the mean number of treatment days was 4.7 with a standard deviation of 9.3. For 10 subjects with bipolar disorder, the mean number of treatment days was 8.8 with a
Does the additional survey information from part (b) have much of an effect on the sample size that is required?
Describe the importance of Tchebysheff's Theorem to the ability to find bounds of probability.
Should you be concerned about the likelihood that it is highly unlikely that a density function will provide a perfect representation of the data?
Explain the concept and application of uniform distribution.
What is the concept of normal distribution and analyze why it is a widely used probability distribution.
Describe what is meant by a binomial experiment. How do binomial experiments apply to each of the four probability
The Poisson distribution can be a reasonable approximation of the binomial distribution. Explain why this may/may not be true.
Describe a scenario where you believe a binomial distribution would be appropriate. Describe a scenario where you believe a geometric distribution would be appropriate. Explain your reasoning for bo
Calculate the correlation coefficient, r, for the data below
The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles. Management beliveves that due to a new production process, the life expectancy of its tires has incre
A factory produces computer chips, and the proportion of defective chips is 0.01, i.e., p=0.01. Suppose you take a sample with 25 chips, and 1 out of them is defective. And let X be the number of de
Sixty-four randomly selected fuses were subjected to a twenty percent overload, and the time to failure was recorded. It was found that the sample average and standard deviation were x bar = 8.5 and
Now the group is 4500 people and 1000 of them are left-handed. As before, eight of them are selected and X - the number of left-handed among 8 - is recorded.
From these data, estimate the average height of all adults and calculate a bound on the error of estimation (assume that approximately 50% of adults are male).
A simple random sample of 102 engineering students was taken from a population of 750 engineering majors. It was found that out of these 102 students, 4 were civil engineering majors and 53 were ele
Every statement about a confidence interval contains two parts: the level of confidence and the interval. Suppose that an insurance agent estimating the mean loss claimed by clients after home burgl
Quality are reliability are becoming important aspects of computer hardware and software. Past experience shows that the probabiltiy of failure during the first 1000 hours of operation for 16-kbit d