Chapter 7
Find the z score for a 92% confidence level
What is 1.75
If the mean wage was $6.75 last year and the claim is that this year's wage is greater, name H0 and H1
What is H0=mu=6.75, H1=mu>6.75
For the following conjecture, state the null and alternative hypotheses. An article reports that
the mean age of gamblers in Las Vegas is less than that of Atlantic City.
What is H0=mu1-mu2=0 H1=mu1-mu2<0
The range of values for the correlation coefficient is from ___ to ___
What is -1 to 1
8 randomly selected social networking sites have a mean of 13.1 million visitors. The population standard deviation is 4.1 million. Find the 95% confidence interval of the true mean.
What is 10.259,15.941
How do you find p value?
What is find the test level area on your Z table or find the test value on your t table (or interval)
The mean sodium content of movie popcorn is 980 mg per container. A researcher randomly selects two samples of 30 containers of popcorn from two different movie theaters. Is there a difference in the sodium content of the popcorn containers? a=0.05. Use the critical value method and tables. (photo)
What is there is enough evidence. CV=1.96, test value=2.15
Is there a linear relationship between the variables? (photo) alpha=.05
What is there is a significant relationship between the variables (r=.929 CV=+-.811)
50 students in grades 4 through 12 found 68% have classroom Wi-Fi access. Find the 99% confidence interval of the population proportion.
What is .51007, .84993
there is a claim that a certain population has a mean, µ, that is greater than 8. You want to test this claim, so you collect a large random sample from the population. a=.05, CV=1.65, and test=2.779. Do you reject?
What is reject the null hypothesis
Does a student retain more from watching a movie or reading a book? book=x1, film=x2, conduct a d test (photo)
What is there is not enough evidence (CV=3.143, test=2.335
How do you know if a regression analysis should be done?
What is if r is greater than the critical value, a regression analysis should be done
Find the minimum sample size to be 95% confident with less than a .75 inch margin of error if the standard deviation is 1.2in.
What is 10
Mean SAT score is 598, SD=35. A special preparation course claims that the mean SAT score, µ, of its graduates is greater than 598. N=60 Mean SAT score was 610. At the 0.01 level of significance, can we conclude that the population mean SAT score for graduates of the course is greater than 598?
What is support the claim
A recent study of 50 ages 25 to 29 years old found that 42%have a college degree, whereas another study of 50 ages 35 to39 years old found that 34% had a college degree. At α=0.05, test the claim that there is no proportion difference. Find the 95% confidence interval for the proportion difference.
What is there is not enough evidence to reject the claim
(-0.1096-.2696)
Is there a linear relationship between the variables? (photo)
What is no, r=.578, CV= +-.878
Conduct the true proportion for a 99% confidence interval if 26% is the previous estimate and the margin of error is within 3% or less.
What is 1423 (proportion sample size formula)
A data scientist at a consumer advocacy group conducts a hypothesis test at the 0.05 level of significance to determine if the proportion, p, of all raffle tickets being sold online that are winners is different from the advertised 20%. N=200, sample p=.15
What is not enough evidence to support the claim (z=-1.768, p=.077)
In Cleveland, a sample of 75 mail carriers showed that 10 had been bitten by an animal. In Philadelphia, in a sample of 53 mail carriers, 17 had received animal bites. Is there a significant difference in the proportions? Use α=0.01 and use p 1 for the proportion of mail carriers in Cleveland. Find the 99% confidence interval.
What is there is not enough evidence to support the claim (-.3811-.0062)
Is there a linear relationship between the variables? (Photo)
What is yes r=-.887, CV=+-.707