BUS 310: Business Analytics II
Homework 1 – due through Assignments in Blackboard
Complete each problem on a separate worksheet in a single Excel file. Rename the separate worksheets with the respective problem number.
You may have to copy and paste datasets into your homework file first.
Name the file with your last name, first initial, and HW 1.
Submit your completed file in Blackboard.
Write your written responses to the questions in blank cells under your calculations.
1.Complete Problems 13 and 14 on pages 241-242 of your textbook. Interpret the results of each interval in context. For each question, just use the Confidence Intervals Template.
2.Suppose you know that IQ scores of incoming freshman are normally distributed with a population standard deviation of 15. If a sample of 30 incoming freshman have a sample mean IQ of 119.3, what is a
a.90% interval estimate of the population mean IQ for incoming freshman?
b.99% interval estimate of the population mean IQ for incoming freshman?
c.What is the effect of increasing the confidence level?
3.Suppose that you know that the normal body temperature of adults is normally distributed with a population standard deviation of 1°. If a sample of 10 adults are sampled with a sample mean body temperature of 98.15°, what is a
a.95% interval estimate of the population mean normal body temperature?
b.Change the sample size to 100, but keep the rest of the statistics the same. Now what is the interval estimate?
c.What is the effect of increasing the sample size?
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