A brochure claims that the average maximum height a certain type of plant is 0.7 m. A gardener suspects that this estimate is not accurate locally due to soil conditions. A random sample of 43 plants is taken. The mean height of the plants in the sample is 0.65m. Using a 1% level of significance, perform a hypothesis test to determine whether the population mean is different from 0.7m. Assume that the population standard deviation is 0.2 m.

STEP 1. H₀: m H₁: m NOTE: For enter /=

STEP 2. This test is (e) left-tailed, (f) two-tailed or (g) right-tailed test.

This test is (enter e, f or g)

STEP 3. The critical value (s) is

Use the following chart to identify the critical value (s)

Left-tailed Two-tailed Right tailed

=10% z = -1.28 (A) z=1.65 (B) z =1.28 (C)

=5% z = -1.65 (D) z=1.96 (E) z = 1.65 (F)

=1% z = -2.33 (G) z=2.58 (H) z = 2.33 (I)

The critical value (s) is/are (Enter a letter A through I)

STEP 4. The test statistics is (Enter a z-score rounded to two decimal places)

The test statistics is z = [g]

STEP 5. Make the decision.

A: Reject the null hypothesis

B: Do not reject the null hypothesis.

The decision is (Enter A or B