Statistics Week 5
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Determine whether the claim stated below represents the null hypothesis or the alternative hypothesis. If a hypothesis test is performed, how should you interpret a decision that (a) rejects the null hypothesis or (b) fails to reject the null hypothesis? A scientist claims that the mean incubation period for the eggs of a species of bird is less than 57 days.
russellc, , Statistics, 0
see excel spreadsheet. This your answer


In a survey of 641 males ages 1864, 394 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. The 90% confidence interval for the population proportion p is The 95% confidence interval for the population proportion p is Interpret your results of both confidence intervals. Which interval is wider?
russellc, , Statistics, 0 
Determine whether to reject or fail to reject Upper H 0 at the level of significance of a) alpha equals 0.02 and b) alpha equals0.09.
russellc, , Statistics, 0
Upper H H0: mu μ equals=109 Upper H Subscript aHa: mu μ not equals≠109 and P =0.02080.0208. see excel spreadsheet. This your answer

Match each Pvalue with the graph that correctly displays its area.
russellc, , Statistics, 0
Pequals=0.2709 Pequals=0.0793 Pequals=0.0286 Pequals=0.0143 see excel spreadsheet. This your answer


Find the minimum sample size n needed to estimate p for the given values of c, a, and E.
russellc, , Statistics, 0
c = 0.90. a = 9.9. and E = 2 Answer = 67

You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 60 home theater systems has a mean price of $140. Assume the population standard deviation is $15.40 Construct a 90% confidence interval for the population mean. The 90% confidence interval is (nothing,nothing).
russellc, , Statistics, 0