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1. A telephone company claims that less than 15% of all college students have their own...

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Basic Math

1. A telephone company claims that less than 15% of all collegestudents have their own cell phone plan. A random sample of 70students revealed that 8 of them had their own plan. Test thecompany's claim at the 0.05 level of significance.

2. A college statistics instructor claims that the mean age ofcollege statistics students at a local Dallas-based institution is23. A random sample of 35 college statistics students revealed amean age of 25.1. The population standard deviation is known to be4.1 years. Test his claim at the 0.1 level of significance.

3. A random sample of 85 adults ages 18-24 showed that 11 haddonated blood within the past year, while a random sample of 254adults who were at least 25 years old had 18 people who had donatedblood within the past year. At the 0.05 level of significance, testthe claim that the proportion of blood donors is not equal forthese two age groups.

Answer & Explanation Solved by verified expert
3.8 Ratings (482 Votes)
1 Below are the null and alternative Hypothesis Null Hypothesis p 015 Alternative Hypothesis p 015 Test statistic z pcap psqrtp1pn z 01143 015sqrt015101570 z    See Answer
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