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One correct argument for using a two-tailed test, even if there is a clear basis for...

One correct argument for using a two-tailed test, even if there is a clear basis for predicting a result in a specific direction, is that: A.If the null hypothesis is true, a failure to reject it will provide stronger evidence in support of the null B.One-tailed tests cannot be used on most studies using more than one group C. An unexpected result opposite of what was hypothesized is not ignored D. A two-tailed test improves the chances of getting a statistically significant result

A researcher is interested in whether blood pressure decreases among adults who eat dark chocolate. The mean systolic blood pressure of the population is 135 with a standard deviation of 15. She tests a sample of 100 adults who eat dark chocolate and finds their mean systolic blood pressure to be 120. What is the null hypothesis? μ = 135 μ ≠ 135 μ > 135 μ ≥ 135

math   Statistics-And-Probability   
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Answer #1

This is the left tailed test .

The null hypothesis is

H0 :   ≥ 135

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