Hypothesis Testing and Sample Size

The video tutorial covers hypothesis testing about means when the population standard deviation is unknown. It explains the use of the T distribution and provides detailed steps for computing T Alpha. Two examples are discussed: one involving a cereal manufacturing company and another involving a hybrid vehicle manufacturer. The tutorial guides viewers through setting up hypothesis tests, calculating test statistics, and applying rejection rules.

What is the primary distribution used when Sigma is unknown in hypothesis testing about means?

• T distribution

• F distribution

• Chi-square distribution

• Z standard normal distribution

When computing T Alpha, what is the first step?

• Compute degrees of freedom

• State the upper tail area as Alpha

• Find the T value in the chart

• Calculate the sample mean

In the Golden Oat Cereal example, what is the sample size?

• 30

• 100

• 16

• 50

What is the null hypothesis in the Golden Oat Cereal example?

• The mean weight is greater than 16

• The mean weight is less than 16

• The mean weight is not equal to 16

• The mean weight is equal to 16

In the Hybrid Vehicle example, what is the sample size?

• 30

• 100

• 16

• 50

What is the alternative hypothesis in the Hybrid Vehicle example?

• The mean miles per gallon is not 40

• The mean miles per gallon is less than 40

• The mean miles per gallon is at least 40

• The mean miles per gallon is exactly 40