Small Sample Mean Problem. A study was done to determine the effect of vitamin s

Question

Small Sample Mean Problem.

A study was done to determine the effect of vitamin supplements for the mother on the birth weight of babies. The data below show the summary statistics and a stem and leaf plot of the birth weight of 16 babies.

Weight is in kilograms (kg). WEIGHT Stem Leaf 2 47 Mean 3.675 2* 54 Standard Error 3 02 22 39 43 Median 3.705 3* 52 68 73 73 Mode 3.730 4 09 13 33 37 Standard Deviation 0.657 4* 47 68 Sample Variance 0.432 Kurtosis -0.552 in kg, stem is whole number 2|47 is 2.47 Skewness -0.356 Range 2.210 Minimum 2.470 Maximum 4.680 Sum 58.800 Count 16

The researchers felt that vitamin supplements would increase birth weight. Based on that, their test should be a 1-tailed test upper test.

True

or

False

Explanation / Answer

Since we do not know the population variance and sample size is less than 30, we will use t test. Also, the alternative hypothesis will contain > sign so we will use upper tail t test.

Hence,

The statement is TRUE.

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