In Exercises 7–10, explain whether the hypothesis test is left-tailed, right-tailed, or two-tailed. A nonprofit consumer organization says that the standard deviation of the starting prices of its top-rated vehicles for a recent year is no more than \$2900.

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Step 1: Understand the hypothesis test setup. The null hypothesis (H₀) states that the standard deviation of the starting prices of the top-rated vehicles is no more than \$2900. This can be written as H₀: σ ≤ 2900, where σ represents the population standard deviation.

Step 2: Identify the alternative hypothesis (H₁). The alternative hypothesis challenges the null hypothesis and states that the standard deviation is greater than \$2900. This can be written as H₁: σ > 2900.

Step 3: Determine the direction of the test based on the alternative hypothesis. Since the alternative hypothesis (H₁) specifies that the standard deviation is greater than \$2900, this indicates a right-tailed test.

Step 4: Recall the definition of a right-tailed test. A right-tailed test is used when the alternative hypothesis suggests that the parameter of interest is greater than the value stated in the null hypothesis.

Step 5: Conclude that the hypothesis test is right-tailed because the alternative hypothesis focuses on values of the standard deviation that are greater than \$2900.

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Hypothesis Testing

Hypothesis testing is a statistical method used to make decisions about a population based on sample data. It involves formulating a null hypothesis (H0) and an alternative hypothesis (H1), then using sample data to determine whether to reject H0. The outcome helps in assessing whether there is enough evidence to support a specific claim about a population parameter.

One-Tailed vs. Two-Tailed Tests

In hypothesis testing, a one-tailed test evaluates the direction of an effect, either testing if a parameter is greater than or less than a certain value. A two-tailed test, on the other hand, assesses whether a parameter is significantly different from a specified value in either direction. The choice between these tests depends on the research question and the nature of the hypothesis.

Standard Deviation and Population Parameters

Standard deviation is a measure of the amount of variation or dispersion in a set of values. In the context of hypothesis testing, it is often used to describe the variability of a population parameter. When a claim is made about the standard deviation, such as it being 'no more than' a certain value, it sets the stage for testing whether the actual standard deviation exceeds this threshold, influencing the type of test used.