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A mechanical press is used to mold shapes for plastic toys. When the machine is adjusted and working well, it still produces about .08 defective toys. The toys are manufactured in lots of n=100.
Let r be a random variable representing the number of defective toys in a lot. Find the probability that between 7 and 9 defective toys are produced in a lot. Find the probability that between 7 and 9 defective toys are produced in a lot of n = 100 toys. That is, find P (7 <= r <= 9).
What is the purpose of sampling? What are some concerns and dangers of sampling? How important is the sample design to data validity? Explain.
A drawer contains 11 identical red socks, and 8 identical black socks. Suppose that you choose 2 socks at random in the dark
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
Perform hypothesis testing on one variable's data.
The boys with certificates of recognition. What time would the boys need to beat in order to earn a certificate of recognition from the fitness association?
Choose any Statistic business problem and develop a problem statement which can be addressed with survey research. Prepare a 10-13 question survey to collect primary data regarding your selected problem statement.
Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with .05.
The odds ratio between treatments (A, B) and outcome (death, survival) equals 2.0. What do you think about the following interpretation: "The probability of death with treatment A is twice that with treatment B". If you think, the above interpreta..
Suppose x follows a distribution with density function: f(x)=C*abs(x-2), 0 =
Bill calculates a linear correlation coefficient between two variable as 1.20. How would you interpret this?
You are given an annual time series with 40 consecutive values and asked to fit a fifth-order auto-regressive model.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
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