homework assignment

If H1: μ1 – μ0  > 0 and α = 0.05, what effect size seems to interest me if I wish to achieve power =0.8 with a sample size of 13? a. 0.5 b. 0.1 c. 0.6 d. 0.8

the solution is not clearly written here

Scenario 2 To measure whether test performance can be predicted based on one's anxiety, a researcher asked his students to come to the lab 15 minutes before they were to take an exam in his class. The researcher measured the students' heart rates and then matched these scores with their exam performance after they had taken the exam. Use the data below and SPSS to test whether heart rate can predict test performance in the population. 田 Student Heart Rate Exam Score A 76 78 B 81 68 60 88 D 65 80 E 80 90 F 66 68 82 60 H 71 95 I 66 84 J 75 75 K 80 62 L 76 51 M 77 63 N 79 71 7. In this specific scenario, are the two variables of interest? Which is the IV and which is the DV? What is the scale of measurement for each variable? Page 3 of 7

ht than ollow Problem 2 Tellowing A study is conducted on the effects of two drugs (simply called Drug A and Drug B) upon hyperactivity in laboratory rats. Two random sample of rats are used for the study - one sample receiving Drug A, the other receiving Drug B. After two weeks, the rats are measured on hyperactivity with the following results: Drug A: X, = 75.6 S1 = 3.5, n, = 18 Drug B: X2 = 72.8 S2 = 3.2 n2 = 24 1) State the null hypothesis and the alternative hypothesis. 2) Find the critical value. Use a = 0.05 3) Find the standardized t test. 4) Find the p-value 5) Decide whether to reject or fail to reject the null hypothesis. 6) Interpret the result.

Step 1 of 3 :   State the null and alternative hypotheses for the test. Fill in the blank below. H0: μd=0 Ha: μd⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯0 Step 2: What is the test statistic? Step 3: Do we reject the null hypothesis? Is there sufficient or insufficient data?

Ho : H= 1.87 H1 : u tcrit = 1.645, then reject Ho; otherwise fail to reject Ho. Oa = 0.05; one-tailed; if tobt > tcrit= 1.761, then reject Ho; otherwise fail to reject Ho. Oa= 0.05; one-tailed; if zobt < Zcrit = -1.645, then reject Ho; otherwise fail to reject Ho. %3D α. QUESTION 20 For 6 months we worked with a groun of 15 severelv mentally handicapped individuals in an attempt to teach them self-care through imitation. For a second 6- Save All Ar Click Save and Submit to save and submit. Click Save All Answers to save all answers.

3. solve for s2  = t  = t    > t    <

E 3 of 12 Questions Completed 7 out of 12 Resources Submit All Press esc to exit full screen 1 Question Question 3 of 12 > An analyst at a state's environmental quality commission has just finished processing salt concentration tests on 60 wells in 2 Question Washington County to represent the more than 1,000 wells across the state. Water with salinity concentration less than 0.05% is considered fresh. 3 Question 0.03 on this sample of wells to determine if the overall salt concentration of the state's water supply exceeds 0.05%. The shape of the sample data is approximately symmetric The analyst decides to run a one-sample t test at a significance level of a = 4 Question with no outliers, and its statistics are 5 Question x = 0.048% Sx = :0.0366% 6 Question P-value :0.0166 7 Question where x is the sample mean, sz is the sample standard deviation, and the P-value is the probability that results from the t test. The analyst decides that there is enough evidence to conclude that the…

Please help with this statics question, not sure if my answers are correct. Would you please help solve? Thanks

#2

ASSESSMENT OF PERFORIMANLE / PRODUCT Direction: Apply the steps that you learned in hypothesis testing to the given Problem below. Write your answer on a separate sheet of paper. Problem : Consider a study wherein the effectiveness of banana leaves as an organic cooked rice Wrapper was compared to that of alumimum foil The number of bacterial colonies in the two kinds of food wrappers was measured after 12 hours at room temperature. The ev is 28, £= 0.01. The result of computad value is 0.8. Hvnothesis: Ho: 2. Ha: 3. Level of Sienificance: 4. Statistical Tool: 5. Computation Results: 6. Decision Rule: 7. Internretation:

14) part B

If H1: μ1 – μ0 > 0 and α= 0.05, what should your sample size be to achieve power = 0.9 if you're only interested in δ = 0.1? The answer is: 857. Please explain and provide a solution to this problem.

An article in the San Jose Mercury News stated that students in the California state university system take 4.5 years, on average, to finish their undergraduate degrees. Dr. Lewis believes the mean time for students at Clayton State University is longer than this average. A survey of 49 graduates from Clayton State had a mean time of 5.1 years to complete their Bachelor's degree, with a sample standard deviation of 1.2 years. Correctly identify the null and alternative hypotheses for this study:

Attached is the image of my homework. I was wondering how I know if it's directional or non directional hypothesis based on the problem. Additionally, I was wondering how to calculate df since this is t test for two independent samples. thank you!

Solve the problem. From the TI-84 graphing calculator screenshots below, choose the screenshot whose shaded area correctly depicts the following hypothesis test results: Ho: p = 0.25, Ha: p > 0.25, a = 0.05, z = 2.01, p-value = 0.022 O O Ar&q=.420349 10w=.201 lup=10 01 AP44=.022216 low=2.01 up=10 Y S

E. D. Species Sum of Sample Values A Σi Yai = 42.3 B C Σi-1 YBi = 44.1 ΣΥΒ Yci = 48.6 Calculate the sum of squares for treatment in a one-way ANOVA with species as the factor. Jade asked her colleague to perform a two-way ANOVA on the same sample data with food type and species as the two factors. Her colleague performed the two-way ANOVA (assuming any required assumptions were satisfied) but unfortunately misplaced the results. All that he could remember was that there was an interaction between food type and species at the 5% significance level but not at the 2.5% significance level. Calculate the two values between which the sum of squares for interaction in this two-way ANOVA must lie.

Ms. Arceo studies if age correlates with the average number of hours of sleep, so she selected a random sample of size 10 and surveyed the needed data.

The average life expectancy of tires 40,000 miles. The company has rece The manager hopes to find out wheth life test, 40 tires were used, and their following SPSS results: One-Sample Statistics Std. Dev Mean time 40881.8262 40 2945 One- df Sig. (2-taile 1.893 Set up Ho: M = 40,000 %3D HA: The test statistic is 1.893 The distribution of the test stati Make the statistical decision (o Express the statistical decision

QUESTION 10 Find the critical value or values of y2 based on the given information. H1: o > 26.1 n = 9 a = 0.01 1.646 21.666 O 20.090 O 2.088

In a population with a = 8, a score of X= 44 corresponds to a z-score of z= -0.50. What is the population ean? Question 12 options: P=36 μ = 40 = 48 μ = 52