Hypothesis Testing 3

What hypothesis states no equality or existence of differences, relationship, or effect?

• Null Hypothesis

• Alternative Hypothesis

• Statistical Hypothesis

• Random Hypothesis

A level of significance of 5% means:

• There's a 5% chance we're wrong

• There's a 5% chance to reject the true null hypothesis

• There's a 5% chance of failing to reject the true null hypothesis.

• There's a 5% chance you'll get an A on the test.

Which of the following shows a right-tailed test?

• H1: µ < 15

• H0: µ < 15

• H1: µ > 15

• H0: µ > 15

A Type I error is when:

• We obtain the wrong test statistic

• We reject the null hypothesis when it is actually true

• We fail to reject the null hypothesis when it's actually false

• We reject the alternate hypothesis when it's actually true

Which of the following is not an option for an alternative hypothesis?

• Ha = k

• Ha > k

• Ha < k

• Ha ≠ k

What does it mean to say a test is two-tailed?

• Ha = k

• Ha > k

• Ha < k

• Ha ≠ k

If the test is two-tailed, the critical region, with an area equal to α, will be on the left side of the mean.

• True

• False

A car manufacturer advertises that its new subcompact models get 47 mpg. If μ is the mileage of these cars, what could be the null and alternate hypothesis if we wanted to check if the car's mpg is overrated?

• H0 = 47, Ha > 47

• H0 = 47, Ha = 47

• H0 = 47, Ha < 47

• H0 = 47, Ha ≠ 47

The weight of an average male tiger is 440 lbs. The Tiger King feeds the male tigers a specific diet for three months to see if their weight changes. What are the null and alternate hypotheses?

• H₀: μ = 440

  H_A: μ = 440

• H₀: μ = 440

  H_A: μ > 440

• H₀: μ = 440

  H_A: μ < 440

• H₀: μ = 440

  H_A: μ ≠ 440

In a recent survey, the average amount of money

students have in their pockets is $5.40 with a standard

deviation of $1.20. A teacher feels that the average

amount is actually higher. She surveys 80 randomly

selected students and finds the average amount is

$5.50. What are the null and alternate hypotheses?

• H₀: The average amount of money in pockets = $5.40

  H_A: The average amount of money in pockets ≠ $5.40

• H₀: The average amount of money in pockets = $5.40

  H_A: The average amount of money in pockets > $5.40

• H₀: The average amount of money in pockets = $5.40

  H_A: The average amount of money in pockets < $5.40

• H₀: The average amount of money in pockets > $5.40

  H_A: The average amount of money in pockets = $5.40