In a random sample of 400 employees of a local company, 180 were female.
a. At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
b. At 95% confidence using the p-value approach, test to determine if the proportion of females in the compan
66% of students at a university live on campus. A random sample found that 20 of 40 male students and 40 of 50 of female students lived on campus. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportion of male students who live on campus and the proportion of
pop. size crime
Nashville 569891 46016
Knoxville 173890 11983
Chattanooga 155554 15867
Using the above data write a hypothesis and preform an ANOVA test in excel. Test whether or not the crime rate is different in three different size cities. 0.05.
What is the purpose of a hypothesis test? What goes in the null hypothesis and what goes in the alternate hypothesis? Why is it inappropriate to put a sample statistic in the hypothesis?
If you are testing the hypothesis
H0: population proportion is .5
H1: population proportion is not .5,
and you get .52 for the sample
Flip a coin 30 times and record the results. A fair coin should land on heads 50% of the time, which is the claim that we will use for our hypothesis.
My results after flipping the coin:
17 heads and 13 tails
My hypothesis would be:
Ha: p not = to 0.5
Where p represents the proportion of heads.
Environmental health indicators include air quality, water quality, and food quality. Twenty-five years ago, 47% of U.S. food samples contained pesticide residues. In a recent study, 44 of 125 food samples contained pesticide residues.
a. State the hypotheses that can be used to show that the population proportion declined.
Joe thinks that no more than 20% of students in his Statistics class will get an A in the final examination. To prove his claim, he takes a random sample of 35 students and finds to his surprise that 30% of students got an A. At a 0.01 percent level of significance can we reject Joe's claim?
Professor Jennings claims that 35% of the students at Flora College work while attending school. Dean Renata thinks that the professor has underestimated the number of students with part time or full time jobs. A random sample of 81 students shows that 39 have jobs. Do the data indicate that more than 35% of the students have jo