Confidence interval of the mean head circumference

Reference no: EM1319582

Q1) To help identify baby growth patterns which are unusual confidence interval estimate of mean head circumference of all babies that are two months old is constructed. Random sample of 100 babies is obtained and mean head circumference is found to be 40.6 cm with a standard deviation of 1.6 cm. Determine a 90% confidence interval estimate of the mean head circumference of all two-month-old babies.

i) (39.6,41.6)

ii) (39.0,42.2)

iii) (-1.660,1.660)

iv) (-2.656,2.656)

v) None of the above (do allow for slight rounding errors/table differences in choosing your solution)

Q2) Researcher has conducted a 99% confidence interval that is 10 points wide, based on sample of 36 scores. Suppose that variability among scores stays the same, how large a sample would be required to produce 99% confidence interval that is only 9 points wide?

Reference no: EM1319582

Questions Cloud

Probability for amount requested : What is the probability that: The amount requested is $80,000 or more?

Classifying items into financing : For each of the following items, indicate whether it would be classified and reported under the operating activities (OA), investing activities (IA), or financing activities (FA) section of a statement of cash flows:

Latest equilibrium price also quantity to result : Converse the latest equilibrium price also quantity to result from these changes.

Esmitating the output of the given code : State the output of following statements? cout

Confidence interval of the mean head circumference : Determine a 90% confidence interval estimate of the mean head circumference of all two-month-old babies.

Computation of retained earnings : During 2006, Edgemont Corporation had revenues of $230,000 and expenses-Compute the retained earnings on December 31, 2005, and 2006.

Number of firms in market affect each firms demand curve : Elucidate how does N the number of firms in the market, affect each firms Demand curve. Explain why.

Computing net income-expenses incurred : Assume that retained earnings increased by $240,000 from December 31, 2005, to December 31, 2006, for Miller Corporation. During the year, a cash dividend of $140,000 was paid.

Determining the output : Specify the output if input is diamond diamond? State the output if the input is diamond gold?

User Account

All Pages