A Kami Schoolo.► Prob+and+Stat+Proportion+Testing-Homework.pdf 1005 oporuon Tesmg Name: Directions: Show all 5 steps to hypothesls testing in the following questions. 1. A toy manufacturer claims that...

Question 2 please


Extracted text: A Kami Schoolo.► Prob+and+Stat+Proportion+Testing-Homework.pdf 1005 oporuon Tesmg Name: Directions: Show all 5 steps to hypothesls testing in the following questions. 1. A toy manufacturer claims that at least 23% of the fourteen-year-old residents of a certain city own a skateboard. A sample of 40 fourteen-year-olds shows that 7 own a skateboard. Test the claim at a = 0.05. z= 0.175-0.23/ squareroot 0.23(1-0.23)/40 n=40 = -0.8266 p=.23 P= 0.2042 x=7 fail to reject Ho there is insufficient evidence to support that at least 23% own a 7/40= 0.175 skateboard 2. A study on crime suggested that at least 40% of all arsonists were less than 21 years old. Checking local crime statistics, a researcher found that 30 out of 80 arson suspects were fewer than 21. At a = 0.10, should the crime study's statement be believed? 3. An engineering school's dean claims that 21% of the school's graduates are women. In a graduating class of 143 students, there were 38 females. Does this result suggest that the dean's claim is believable? Use a = 0.05. DELL 6