Please explain how you got your answer and how you determined it was a 90% confi

Question

Please explain how you got your answer and how you determined it was a 90% confidence interval, not 95. Thank You. 8. A botanist is interested in testing H u m 3.5 cm versus H u 3.5. where u the mean petal length of one variety of flowers A random sample of 50 petals gives significant results at a 5 percent level of significance. Which of the following statements about the confidence interval to estimate the mean petal length is true? (A) The specified mean length of 3.5 cm is within a 90 percent confidence interval. (B) The specified mean length of 3.5 cm is not within a 90 percent confidence interval (C) The specified mean length of 3.5 cm is below the lower limit of a 90 percent confidence interval. (D) The specified mean length of 3.5 cm is below the lower limit of a 95 percent confidence interval. E) Not enough information is available to answer the question.

Explanation / Answer

The answer is A
If it satisfies in a 5 percent level of significance( i,e 95 % confidence interval) then it satisfies the 90 percent confidence naturally.
alpha=5%
so confidence is 100-alpha=95 percent

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