Describe the Theory, Process, and Analysis of Results for Hypothesis Testing and Its Use in Evaluating a Model DATA-SCIENCE-FOUNDATIONS Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the first step in conducting a hypothesis test?

   • ADetermine the p-value
   • BState the null and alternative hypotheses
   • CCollect the sample data
   • DCalculate the test statistic
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2. 2application · medium

   A data analyst is conducting a hypothesis test to compare the variance of two processes. He states the null hypothesis as 'the variances are equal' and the alternative as 'the variances are not equal.' He collects data and computes a test statistic. What is the next step in the hypothesis testing process?

   • ACollect more data to ensure the test statistic is stable.
   • BChange the alternative hypothesis to match the observed data.
   • CImmediately reject the null hypothesis if the test statistic is large.
   • DDetermine the p-value associated with the test statistic.
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4. 3application · medium

   A data scientist is testing whether a new pricing strategy increases average revenue per user. She sets the significance level at 0.01. The test produces a p-value of 0.02. What is the correct decision?

   • AReject the null hypothesis because the p-value is less than 0.05.
   • BReject the null hypothesis because the p-value is small.
   • CFail to reject the null hypothesis because the p-value is greater than the significance level.
   • DAccept the null hypothesis and conclude the pricing strategy has no effect.
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5. 4application · medium

   A data scientist is testing whether a new model has a lower mean absolute error (MAE) than the current model. The null hypothesis is that the MAE is the same. The test yields a p-value of 0.04. At a significance level of 0.01, what is the correct decision?

   • AAccept the null hypothesis and conclude the new model is not better.
   • BReject the null hypothesis because the p-value is small.
   • CFail to reject the null hypothesis because the p-value is greater than the significance level.
   • DReject the null hypothesis because the p-value is less than 0.05.
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6. 5foundation · easy

   After calculating the p-value in a hypothesis test, what is the next step?

   • AState the null and alternative hypotheses
   • BCompare the p-value to the significance level
   • CCollect more data to confirm the result
   • DAccept the alternative hypothesis
   Reveal Solution Discussion Select an answer first