Suppose that 14 children were surveyed to determine how long they had to use training wheels. It was revealed that they used them an average of 6 months with a sample standard deviation of 3 months. Assume that the underlying population distribution is normal. A.) Construct a 90% confidence interval for the population mean length of time using training wheels. B.) Provide an interpretation of your interval.

Q: Before After 6.9 6.3 3.6 2.1 7.3 7.1 12.8 8.6 8.5 8.2 10.1 6.4 8.4 3.9 5.2 2.1

A: We find the differences of ‘before’ and ‘after’. di= Xi-Yi

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A: Formula :

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.