a through c please Percent The data shown to the right represent the age (in wee
ID: 3356861 • Letter: A
Question
a through c please
Percent The data shown to the right represent the age (in weeks) at which babies first crawl, based on a survey of 12 mothers. Mean = 41.25 Standard Deviation 9.39 Normal Probability Plot Correlation 0.984 | Click the icon to see the table of cntical values of the correlation coefficient. 0 20 40 60 Age (in weeks) 30 40 50 6D 52 30 47 37 52 35 4435 26 37 56 (a) Because the sample size is small, we must verify that the data come from a population that is normally distributed and that the sample does not contain any outliers. Are the conditions for constructing a confidence interval about the mean satisfied? 0 A. No, there are no outliers, but the population is not normally distributed O B. No, the population is normally distributed, but the sample does contain an outier ° C. Yes, the population is normally distributed and the sample does not contain any outliers D. No, the population is not normally distributed and the sample contains an outer b) Construct a 95% confidence interval for the mean age at which a baby first crawls Select the correct choice and if necessary, fill in the answer boxes to complete your choice (Use ascending order. Round to one decimal place as needed) O B. A 95% confidence interval cannot be constructed. (c) What could be done to increase the accuracy of the interval without changing the level of confidence? Click to select your answerExplanation / Answer
The statistical software output for this problem is:
One sample T confidence interval:
: Mean of variable
95% confidence interval results:
Hence,
a) Option C is correct.
b) 95% confidence interval:
Option A; (35.3, 47.2)
c) Option C is correct.
Variable Sample Mean Std. Err. DF L. Limit U. Limit Data 41.25 2.7111582 11 35.282781 47.217219Related Questions
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