Confidence interval for the population mean weight

Reference no: EM1317839

1. A biologist has found the average weight of 12 randomly selected mud turtles to be 8.7 lb with standard deviation 3.6 lb. Find a 90% confidence interval for the population mean weight of all such turtles.

2. How tall are college hockey players? The average height has been 68.3 inches. A random sample of 14 hockey players gave a mean height of 69.1 inches. We may assume that x has a normal distribution with σ = 0.9 inch. Does this indicate that the population mean height is different from 68.3 inches? Use 5% level of significance.

a) State the null and the alternate hypothesis.

b) Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).

c) Compute the z or t value of the sample test statistic.

d) Find the P value or an interval containing the P value for the sample test statistic.

e) Based on your answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.

Reference no: EM1317839

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