Flashcardziz for Start of Unit 4

Front

What is a left-sided hypothesis test?

Back

A left-sided hypothesis test is a statistical test where the alternative hypothesis states that the parameter of interest is less than the value specified in the null hypothesis. The rejection region is located in the left tail of the distribution.

Front

What is the critical value in hypothesis testing?

Back

The critical value is a threshold that determines the boundary for rejecting the null hypothesis. It is based on the significance level (alpha) and the sample size.

Front

If α=0.1 and n=29 for a right-tailed hypothesis test, what is the critical value?

Back

The critical value is 1.313.

Front

What is a two-tailed hypothesis test?

Back

A two-tailed hypothesis test is a statistical test where the alternative hypothesis states that the parameter of interest is different from the value specified in the null hypothesis, which can be either greater than or less than.

Front

If α=0.05 and n=50 for a left-tailed hypothesis test, what is the critical value?

Back

The critical value is -1.645.

Front

What is the symbol for the alternative hypothesis?

Back

The symbol for the alternative hypothesis is H1 or Ha.

Front

What is the significance level (α) in hypothesis testing?

Back

The significance level (α) is the probability of rejecting the null hypothesis when it is actually true. It represents the risk of making a Type I error.

Front

What is a Type I error in hypothesis testing?

Back

A Type I error occurs when the null hypothesis is rejected when it is true.

Front

What is a Type II error in hypothesis testing?

Back

A Type II error occurs when the null hypothesis is not rejected when it is false.

Front

What is the null hypothesis (H0)?

Back

The null hypothesis (H0) is a statement that there is no effect or no difference, and it serves as the default assumption in hypothesis testing.