07_CaseProcessing

1:30 PM Wed Apr 21 * 75% 88 Q Apple Pencil •.. 100% Untitled Notebook (1) Stats Exam e) Constret Confalenct Iorval or the predict áge Tor a 75 ycar ola male. Let x*=75 A50 Const ea Prediction Interval for the predd age fo a ale. Let x*-75 2. As concrete cures it gains strength. The following data represents the 7 day and 28 day strength (in pounds per square inch) of a certain type of concrete. 7 Day Strength, x 28 Day Strength, y 2300 4070 3390 5220 2430 4640 2890 4620 3330 4850 2480 4120 3380 5020 2660 4890 2620 4190 3340 4630 a) Calculate r b) Calculate the least regression line c) Test whether there is a linear relationship between 7-day strength and 28-day strength. Let a=0.05 d) Construct a 95% Confidence Interval for the slope of the

Jump to level 1 The additional growth of plants in one week are recorded for 6 plants with a sample standard deviation of 2 inches and sample mean of 12 inches. t* at the 0.10 significance level = Ex: 1.234 Margin of error = Ex: 1.234 Confidence interval = [Ex: 12.345 Ex: 12.345] [smaller value, larger value] Check Next 2

= For the hypothesis test Ho : u the P-value for the test statistic to = -1.84. = 10 and H1 : u < 10, having variance unknown and sample size n = 12, find A).05 < p-value < .01 (B) 0 < p-value < .005 (C) .01 < p-value < .025 (D) .025 < p-value < .05 E) .05 < p-value < .1

000 hypothesis 0.9664; fail to reject the null hypothesis O 0.0672; fail to reject the null hypothesis QUESTION 4 Use the given information to find the P-value. Also, use a 0.05 significance level and state the conclusion about the null hypothesis (reject the null hypothesis or fail to reject the null hypothesis). With H1: p < 3/5, the test statistic isz = -1.68. O 0.093; fail to reject the null hypothesis 0.0465; fail to reject the null hypothesis 0.0465; reject the null hypothesis 0.9535; fail to reject the null hypothesis QUESTION 5 Formulate the indicated conclusion in nontechnical terms. Be sure to address the original claim. The owner of a football team claims that the average attendance at games is over 694. nd be is therefore justified in moving the team to a city with a larger stadium. - that a hypothesis test of the claim has been conducted and that the

00 c.za/ultra/courses/_6960 1/cl/outline Your answers are saved automatically. Remaining Time: 2 hours, 25 minutes, 58 seconds. ¥ Question Completion Status: NTS Complete the following ANOVA table for a study with k = 3 and N = 98. The significance level for the test will be 0.05. What is the null hypothesis for this analysis? Source SS DF MS F-stat. F-crit Between groups(Treatment) 12.50 Within groups (Error) Total %3D O B. At least one of the fish populations has a different mean. O D. Not all the fish populations have the same mean. Queste A Moving to the next question prevents changes to this answer. 23°C Sunny ^O 4 EN pe here to search delcie home 6. pause W N

zy Section 7.2- MAT 240: Applied S X O https://learn.zybooks.com/zybook/MAT-240-J4373-OL-TRAD-UG.22EWA/chapter/7/section/2?content_resource id=5.. A Q ary > MAT 240: Applied Statistics home > 7.2: Confidence intervals for population proportions E zyBooks catalog Help/FAQ 387674.1891676. may? Start Understanding student demographics is important for a college in deciding what programs will most benefit students. A sample of students is taken to determine what proportion of students identify as Hispanic or Latino. The results of the sample are shown below. Student sample HIspanic/Latino (x) Sample size (n) 68 400 Confidence Level 95% Critical Value 1.96 Margin of Error 0.037 What is the population parameter? Pick What is the point estimate for the population proportion? p = Ex: 0.99 The data suggests a Pick v confidence exists that the proportion of students who identify as Hispanic or Latino is between Ex: 0.123 Check Try again Feedback? -arch 72°F A a O 57 PrtSc Insert Delete F6 F8 F9…

A company is testing the effectiveness of three new pills used to treat high blood pressure. 30 people with high blood pressure were selected. The 30 people were then divided into three groups of 10 each. Each person in a subgroup was given one of these pills. The number of points by which each person's blood pressure was reduced after one month of use is as follows: PILL A PILL B 7 15 21 17 16 14 16 14 21 17 15 PREHRANS 39 30 23 31 9 25 23 19 27 39 29 12 15 18 21 15 12 21 18 29 PILL C Is there a significant difference in the ability of each of these drugs to reduce blood pressure? (Use a .05 level of significance.)

Let x represent the number of mountain climbers killed each,year. The long-term variance of x is approximately o Suppose that for the past 12 years, the variance has been s = 118.3. = 136.2 Use a 1% level of significance to test the claim that the recent variance for number of mountain-climber deaths is less than 136.2 Find a 90% confidence interval for the population variance. (b) Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.) What are the degrees of freedom?

it y" 10. A dbly līne will be shut down for maintenance if the defect rate exceeds 2.3%. Suppose you adopt a 5% significance level and' take compute the proportion that are defective. For what values of the sample proportion will the assembly line be shut down? a random sample 200 items off the assembly line and 0.06 0.05 0.04 0.02 Back Net

Part 6 of 7 (f) Determine whether to reject H. Use the a=0.10 level of significance. Do not reject the null hypothesis H Part: 6/7 Part 7 of 7 (g) State a conclusion. There is not enough evidence to conclude that the mean lead amount is less than 15 micrograms per liter. X

Where are the critical region(s) located in a z-distribution if a one-tailed hypothesis test was conducted to see if a treatment led to a decrease using an alpha = 0.0668 Report the complete z-score (no rounding)

8/12 Determine the P value for this hypothesis test P value =_. Round to three decimal places as needed. do we reject or do not reject a hypothesis?

A random sample of size 8 from a normal distribution has standard deviation s= 89. Test Ho:o=41 versus H, :0<41. Use the a=0.05 level of significance. Part 1 of 5 The hypotheses are provided above. This hypothesis test is a left-tailed test. Part: 1 /5 Part 2 of 5 Find the critical value. Critical value=