The total precipitation in Normal City in January is approximately normally distributed with a mean of 3.2 inches, and a standard deviation of 0.69. A researcher claims that the standard deviation, σ, of the total March precipitation in recent years is less than 0.69. A random sample of 18 precipitation measurements from the last three decades is considered and the mean of these measurements is found to be 3.1 with a standard deviation of 0.45. Is there enough evidence to support the researcher's claim at the 0.1 level of significance?

  

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Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at leest three decimal places and round your answers as specified in the table. (If necessary, consult a list of formuias.) H, :0 The null hypothesis: ", :0 The alternative hypothesis: The type of test statistic: (Choose one The value of the test statistic: (Round to at least three decimal places.) The critical value at the 0.1 level of significance: (Round to at least three decimal places.) Can we support the claim that the standard deviation of the total March precipitation in recent Yes No years is less than 0.74? Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at leest three decimal places and round your answers as specified in the table. (If necessary, consult a list of formuias.) H, :0 The null hypothesis: ", :0 The alternative hypothesis: The type of test statistic: (Choose one The value of the test statistic: (Round to at least three decimal places.) The critical value at the 0.1 level of significance: (Round to at least three decimal places.) Can we support the claim that the standard deviation of the total March precipitation in recent Yes No years is less than 0.74?

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Here we have given that X The total precipitation in Normal city n number of precipitation measu... View the full answer