A group of veterinary researchers plan a study to estimate the average number of

Question

A group of veterinary researchers plan a study to estimate the average number of enteroliths in horses suffering from them. The number of enteroliths is determined by surgery or ultrasound. This requires the participation of a radiologist and a surgeon in the study. The researchers decide that they should only enroll horses seen at the best veterinary hospital in the country to ensure correct counts. Such a hospital will typically see the most severe cases. The researchers will enroll the first 20 horses seen beginning on the day the study is funded. The researchers will calculate ass% confidence interval. The procedure is not valid because the: A. data are counts and, therefore, not Normally distributed. B. average number is not an integer and does not reflect any actual observation. C. sample size is too small for the central limit theorem to apply. D. None of the above. The procedure is valid. The time (in number of days) until maturity of a certain variety of tomato plant is Normally distributed with mean mu and standard deviation sigma = 2.4 1select a simple random sample of four plants of this variety and measure the time until maturity. The sample yields x = 65. A 95% confidence interval for mu, in days, is: A. 65.00 plusminus 4.70. B. 65.00 plusminus 2.35. C. 65.00 plusminus 1 97. D. 65.00 plusminus 3.95. The time in number of days until maturity of a certain variety of tomato plant is Normal distributed with mean mu and standard deviation sigma = 24.1 select a simple random sample of four plants of this variety and measure the time until maturity. The sample yields x = 96. You read on the package of seeds that these tomatoes reach maturity, on average, in 61 days. You want to test to see if your seeds are reaching maturity later than expected, which night indicant that your package of seeds is too old. The appropriate hypotheses are: A. H_0: mu = 65, H_a: mu

Explanation / Answer

Given params of the equation:

xbar = 65

Z for 95% is 1.96

So, CI is xbar +/- Z*sigma/sqrt(n)

=65 +/- 1.96*2.4/sqrt(4)

=65 +/- 2.352

So, option B is the right answer

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