Questions from Statistics Principles

Q: H0: p = 0.25 versus H1: p <

H0: p = 0.25 versus H1: p < 0.25 n = 400; x = 96; a = 0.1

Q: H0: p = 0.9 versus H1: p ≠

H0: p = 0.9 versus H1: p ≠ 0.9 n = 500; x = 440; a = 0.05

Q: H0: p = 0.4 versus H1: p ≠

H0: p = 0.4 versus H1: p ≠ 0.4 n = 1000; x = 420; a = 0.01

Q: Throwing darts at the stock pages to decide which companies to invest

Throwing darts at the stock pages to decide which companies to invest in could be a successful stock-picking strategy. Suppose a researcher decides to test this theory and randomly chooses 100 compani...

Q: Suppose an acquaintance claims to have the ability to determine the birth

Suppose an acquaintance claims to have the ability to determine the birth month of randomly selected individuals. To test such a claim, you randomly select 80 individuals and ask the acquaintance to s...

Q: The website pundittracker.com keeps track of predictions made by individuals

The website pundittracker.com keeps track of predictions made by individuals in finance, politics, sports, and entertainment. Jim Cramer is a famous TV financial personality and author. Pundittracker...

Q: In his book, The Signal and the Noise, Nate Silver

In his book, The Signal and the Noise, Nate Silver analyzed 733 predictions made by experts regarding political events. Of the 733 predictions, 338 were mostly true. (a) Determine the sample proportio...

Q: The drug Lipitor is meant to reduce cholesterol and LDL cholesterol.

The drug Lipitor is meant to reduce cholesterol and LDL cholesterol. In clinical trials, 19 out of 863 patients taking 10 mg of Lipitor daily complained of flulike symptoms. Suppose that it is known t...

Q: Nexium is a drug that can be used to reduce the acid

Nexium is a drug that can be used to reduce the acid produced by the body and heal damage to the esophagus due to acid reflux. The manufacturer of Nexium claims that more than 94% of patients taking N...

Q: An antigun advocate wants to estimate the percentage of people who favor

An antigun advocate wants to estimate the percentage of people who favor stricter gun laws. He conducts a nationwide survey of 1203 randomly selected adults 18 years old and older. The interviewer ask...