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One of the non-destructive tests (NDTs) for assessment of the integrity of concrete structures is ultrasonic pulse velocity testing. The test can signal that a concrete section is either intact or that a problem exists. However, even when a section is intact, there is a small probability that the test equipment may signal a problem (thus generating what is known as a ‘false positive', or the probability of a concrete section actually being intact given that the equipment registers a problem.). Suppose that the probability for a "false positive" is 0.03. What is the probability that at least 1 in 10 successive sections signal a problem when in fact the sections are intact? (Note: Please assume that signals from successive sections are independent of each another.)
use the following sample data to test whether the GPA are different at the 0.05 level of significance.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Would Kruskal-Wallis be the suitable statistical procedure to test this Research Question (RQ)? Describe your answer. When would you use Chi-Square test rather than One-Way Anova?
A suburban hotel derives its gross income from its hotel and restaurant operations. The owners are interested in the relationship between the number of rooms occupied on a nightly basis and the revenue per day in the restaurant.
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 42 days.
The company statistician has reported the mean number of man-hours lost per month but did not keep a record of the total sum. Should the manager order the study repeated to obtain the desired information? Explain your answer clearly.
You own a stock called Insurate, Inc. Your profit for the stock is a random variable (W) with mean 1,000 and variance 400. You would like to buy more stock and you are trying to decide between Insurate
The probability that house sales will increase in the next 6 months is estimated to be 0.25. The probability that the interest rates on housing loans will go up in the same period is estimated to be 0.74. The probability that house sales or intere..
Explain why random samples are preferred to nonrandom samples.
Estimate and interpret the p-value of the calculated test statistic above.
The Aloha Banking Co. is studying ATM use in suburban Honolulu. A sample of 30 ATM's showed they were used the following number of times yesterday.
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