You calculate a 95% confidence interval of 27 + 2 centimeters (cm) for the mean needle length of torrey pine trees. you ask friends to explain this result. the confidence level is the success rate of the method that produces an interval that contains the true value of a population parameter.
(a) one friend believes it means that "95% of all torrey pine needles have lengths between 25 and 29 cm." is that right? selelct the correct explanation.
a. no. the confidence interval refers to the interval containing the standard deviation.
b. no. the confidence interval refers to the population mean needle length u.
c. yes. the confidence interval refers to the interval containing the size of a single pine needle.
d. yes. the confidence interval refers to the range of individual needle lengths.
(b) another friend thinks it means that "we can be 95% confident that the true mean needle length of torrey pine trees is 27 v cm." is that right? select the correct explanation.
a. yes. the estimate gives the exact value of the true mean needle length of torrey pine trees.
b. no. the confidence interval refers to the interval containing the standard deviation.
c. yes. it is the whole interval that estimates the specific length of an individual pine needle.
d. no. it is the whole interval that estimates the population mean needle length.