A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were:

3.087

3.131

3.241

3.241

3.270

3.353

3.400

3.411

3.437

3.477

• Assuming a normal population,using minitab, construct a 95 percent confidence interval for the true mean weight. You will need to enter the data.
• Using minitab, construct a histogram of the sample data. Use the histogram to determine if the assumption of normality is a valid assumption.
• What sample size would be necessary to estimate the true weight with an error of 0.025 gram with 90 percent confidence?