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Suppose the score of architects on a partecular creativity test are normally distributed. What percetage of architects have a Z scores (A) above .10 (B) below 1.10, (C) above .20, (D) below .20 (E) above 1.10, (F) below 1.10 (G) above -.10, (H) below -.10.
A contractor is considering a sale that promises a profit of $34,000 with a probability of 0.7 or a loss (due to bad weather, strikes, and such) of $16,000 with a probability of 0.3. What is the expected profit?
Can the company conclude that the pill is effective at promoting weight loss? Write the hypotheses and conduct the appropriate hypothesis test.
Perform a two-tailed hypothesis test on both the intrinsic and the extrinsic variable's data, using a .05 significance level. Begin by creating a null and an alternate statement.
The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF. Did the change to the process improve the MTBF?
These plot yields followed approximately a normal distribution with mean 88 lb and SD 7 lb. Find the probability that any one randomly selected plot yield is greater than 90 lb.
Consider an acceptance-sampling scheme in which factory takes delivery of a batch of components if random sample of 400 components contains fewer than M defectives.
write down the hypothesis the test used the p-value and the interpretation then hand calculates a 95% CL for the odds ratio estimate on this last test.
Find the percentage of such males that weigh between 190 and 210 lb. (Note: Make sure you choose the flag value closest to 190 and 210.) Give the proportion as a decimal rounded to thousandths.
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.
At the start of the study the mean of the group was 24 and the end of the study the mean of the group was 30. The standard deviation of the difference scores was 12.0 and we had 16 subjects.
A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval estimate for the variance of life expectancy in Europe?
Find the probability that a randomly selected teacher earns and what sample size is necessary to double the standard error of the mean and what sample size is needed to cut the standard error of the mean in half?
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