For a two-tailed hypothesis test evaluating the significance of a correlation, the null hypothesis states that the sample correlation is zero. True or false
Q: Among a random sample of the state's census deciles, there is a -.85 correlation (p=.50) between…
A: Solution: It is given that among a random sample of the state's census deciles, there is a -.85…
Q: For a data set of weights (pounds) and highway fuel consumption amounts (mpg) of ten types of…
A: P value=0.015Sample size (n)=10We have to draw conclusion about the correlation :
Q: Suppose you are studying a summer jobs program for at risk youth. The treatment is randomly…
A: Given the employment probabilities and the arrest the probabilities of the treatment and control…
Q: For a data set of brain volumes (cm3) and IQ scores of eight males, the linear correlation…
A: The p-value for the test statistic is given as 0.231. The objective is to infer if a linear…
Q: A random sample of ten professional athletes produced the following data. The first row is the…
A: Correct answer is Yes since the p-value for the hypothesis test is very close to zero.
Q: A recent study of the relationship between social activity and education for a sample of corporate…
A: Here we have to identify the correct null hypothesis for the analysis.
Q: hypothesis test is conducted at the 0.05 level of significance to test whether or not the population…
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Q: In a statistical test, we have a choice of a left-tailed test, a right-tailed test, or a two-tailed…
A: In hypothesis testing, the claim of the study is stated in alternative hypothesis. In other words,…
Q: A correlation study provides the following data: r = .66 and the study involved 92 participants What…
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Q: For a data set of weights (pounds) and highway fuel consumption amounts (mpg) of four types of…
A:
Q: Small-business telephone users were surveyed 6 months after access to carriers other than Carrier A…
A: We want to test whether the proportion of Carrier A users attempting to learn more about their…
Q: A biologist looked at the relationship between number of seeds a plant produces and the percent of…
A: The sample correlation coefficient between the two variables can be calculated in excel by using the…
Q: A researcher wants to determine if the number of years of education for a parent correlates with the…
A: The independent variable is Years of Education of Parent. The dependent variable is Years of…
Q: A researcher wants to determine if the number of years of education for a parent correlates with the…
A: Use EXCEL to obtain the value correlation coefficient r: EXCEL procedure: Go to EXCEL Go to…
Q: In a statistical test, we have a choice of a left-tailed test, a right-tailed test, or a two-tailed…
A: Explanation: given that in a statistical test, we have a choice of a left-tailed test, a…
Q: Which of the following conclusion would represent a Type II Error? Concluding that the movie will…
A: Hypothesis:Hypothesis is an assumption about the parameter of the population which will be made on…
Q: A nationwide standardized test taken by high-school juniors and seniors may or may not measure…
A: The independent variable is standardized test score. The dependent variable is first-year college…
Q: Do college athletes have similar majors as non-athletes? A survey asks a group of college students…
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Q: physician is concerned people are including too much red meat in their diet, which can increase risk…
A: From the available information ,the claim is that adults have red meat in 60% of the meals. The…
Q: A new fuel injection system has been engineered for pickup trucks. The new system and the old system…
A: Given,Claim:- There is a difference in population variance of gasoline consumption for the two…
Q: A researcher conducts an independent-measures study examining how the brain chemical serotonin is…
A: A. Null and alternate hypotheses: The investigator is specifically interested to test whether the…
Q: For a data set of brain volumes (cm³) and IQ scores of ten males, the linear correlation coefficient…
A: GIven datap=0.621
Q: A researcher wants to determine if the number of years of education for a parent correlates with the…
A: The data shows the number of years of education of the parent and the number of years of education…
Q: The given paired data lists the heights (in inches) of various males who were measured on their…
A: Given n=6 Alpha =0.05
Q: In general, what characteristics of the difference scores are most likely to produce a significant…
A: We have given statement The characteristics of the difference scores are most likely to produce a…
Q: Which of the following describes the effect of an increase in the variance of the difference scores…
A: It is given that the variance of the difference scores increases in a repeated measures design.
Q: medical researcher speculated that frequency of visits to their office may be influenced by type of…
A:
Q: Read through this scenario and look at the data that was collected. State the null and all possible…
A: Provided ANOVA result with replication
Q: A recent study of the relationship between social activity and education for a sample of corporate…
A: Solution: Given: The observed count table is Above average Average Below Average Row Total…
Q: A professor claims that exam scores for non-accounting majors are more variable than for accounting…
A: It is needed to test whether the exam scores for non-accounting majors (X) are more variable than…
Q: Do men and women have similar college majors? Researchers ask a group of college students about…
A: From the provided information, The chi square test statistic is 16.0 and the chi square critical…
Q: A researcher wants to determine if the number of years of education for a parent correlates with the…
A: The independent variable is Years of Education of Parent. The dependent variable is Years of…
Q: you are given the following information about x and y. xi independebt varible yi…
A: In the question it is given that xi is a independent variable and yi is independent variable and…
Q: An educational psychologist studies the effect of frequent testing on retention of class material.…
A: State the hypotheses. That is, there is no evidence to conclude that testing frequency has a…
Q: Two surfers and statistics students collected data on the number of days on which surfers surfed in…
A: Given: For Longboard n1=30, X¯1=12.40 S1=5.4431 For Shortboard n2=30, X¯2=10.03 S2=4.9514
For a two-tailed hypothesis test evaluating the significance of a
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- The average gasoline price per gallon (in cities) and the cost of a barrel of oil are shown for a random selection of weeks from 2009-2010. Is there a linear relationship between the variables? Oil ( $ ) 55.78 41.96 52.08 57.28 58.15 67.59 Gasoline ( $ ) 2.654 2.269 2.445 2.71 2.805 3.071 Compute the value of the correlation coefficient. Round your answer to at least three decimal places. =rTwo surfers and statistics students collected data on the number of days on which surfers surfed in the last month for 30 longboard (L) users and 30 shortboard (S) users. Treat these data as though they were from two independent random samples. Test the hypothesis that the mean days surfed for all longboarders is larger than the mean days surfed for all shortboarders (because longboards can go out in many different surfing conditions). Use a level of significance of 0.05. Longboard: 4,9,8,4,9,8,8,6,7,9,11,11,11,13,12,16,14,9,11,18,20,15,10,16,20,20,8,20,21,23 O Shortboard: 6,4,4,6,8,8,6,9,4,6,7,5,9,7,4,16,13,11,13,13,11,15,10,10,13,14,11,21,21,12 Determine the hypotheses for this test. Choose the correct answer below. O A. Ho: HL = Hs O B. Ho: HL = Hs OC. Ho: HL # Hs Ha: HL Hs O F. Ho: HL = Ps Ha: HL = Ps Ha: HL = Hs Ha: HL > Hs Find the test statistic for this test. t = (Round to two decimal places as needed.) Find the p-value for this test. p-value = (Round to three decimal places…Reject or Fail to Reject the null hypothesis. There is or is not sufficient evidence to support the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment.
- Test the claim that the proportion of people who own cats is significantly different than 20% at the 0.1 significance level. The null and alternative hypothesis would be: Ho:p 2 0.2 Ho:p = 0.2 Ho: u 0.2 Ho: u = 0.2 Ho:p 0.2 H1 : p 0.2 The test is: left-tailed two-tailed right-tailed Based on a sample of 700 people, 11% owned cats The p-value is: 0.1 x (to 2 decimals) Based on this we: O Fail to reject the null hypothesis O Reject the null hypothesisStudents in an AP Statistics class wanted to determine if a person's hand span is associated with the number of candies he or she can pick up from a bowl of candy. For the fourteen students in the class, each student's hand span and the number of candies he or she was able to pick up was recorded. A least- squares analysis was conducted on the number of candies versus hand span. The conditions for inference were checked and deemed reasonable. The regression analysis output is given in the table below. Predictor Constant Coef -8.74 SE Coef 10.81 T -0.81 P 0.434 Hand span 1.26 0.52 2.44 0.031 S=3.34 R-Sq = 33.1% 39. The estimate of the slope of the least-squares regression line using a 95% confidence interval is (A) 1.26 ± 2.18(0.52) (B) 1.26 ± 2.44(0.52) (C) 1.26 ± 2.18 ( (0.521 (D) 1.26 ± 1.96(0.52) (E) 1.26 ± 3.34 (0.52) √14Analysis of Variance (ANOVA) Researchers conducted a study to evaluate the effectiveness of three alcohol treatment programs. The researchers randomly assigned each of the 15 patients to receive one of these treatments. Sixty days later, the researchers measured the effectiveness of the program. One of their measures was the patient’s self-reported need to use alcohol. It was measured on a scale of 1 (low need) to 10 (high need). Test the null hypothesis that the patient’s self-reported need to use alcohol does not differ by type of treatment. Write a concluding statement. Treatment A Treatment B Treatment C 8 6 6 10 5 5 10 10 2 8 2 2 10 4 1
- A hypothesis test on a regression coefficient fails to reject the null hypothesis at the 5% significance level. This means:A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted in the following data: Speed (Miles per Hour) 30 50 39 56 30 24 61 24 51 56 Miles per Gallon 29 24 25 22 30 33 21 35 25 25 Compute the sample correlation coefficient (to 2 decimals and enter negative value as negative number). What can you conclude, based on your computation of the sample correlation coefficient? -strong postive relationship -moderate postive relationship -neither postive or negative relationship -strong negative relationship -moderate negative relationship Select the correct interpretation for the sample correlation coefficient. (i) For driving speeds between 24 and 61 miles per hour, higher speeds are associated with higher miles per gallon. (ii) For driving speeds between 24 and 61miles per hour, higher speeds are associated with lower miles per gallon. (iii) For driving speeds between 24 and 61 miles per hour, lower speeds are associated…Use Excel’s Data Analysis tool to conduct a multiple regression, using Risk of Stroke as the dependent variable, and all the rest of variables as independent variables. Choose confidence level at 99%. Risk of Stroke (%) Age Pressure Smoker (Yes=1) 12 57 152 0 24 67 163 0 13 58 155 0 56 86 177 1 28 59 196 0 51 76 189 0 18 56 155 1 31 78 120 0 37 80 135 1 15 78 98 0 22 71 152 0 36 70 173 1 15 67 135 1 48 77 209 0 15 60 199 0 36 82 119 1 8 66 166 0 34 80 125 1 3 62 117 0 37 59 207 1 Interpret the multiple coefficient of determination R-square. Compare the R-square of the simple linear regression and the R-square of the multiple regression, what does the differences in R-squares tell us? What does F-test for significance tell us?
- A sample contains 61 pairs of values. Find the critical value for the linear correlation coefficient from Table A-6 corresponding to a 0.05 significance level. A. 0.330 B. 0.236 C. 0.279 D. 0.254 ( don't hand writing solution)Students in an AP Statistics class wanted to determine if a person's hand span is associated with the number of candies he or she can pick up from a bowl of candy. For the fourteen students in the class, each student's hand span and the number of candies he or she was able to pick up was recorded. A least- squares analysis was conducted on the number of candies versus hand span. The conditions for inference were checked and deemed reasonable. The regression analysis output is given in the table below. Predictor Constant Coef -8.74 SE Coef T P 10.81. -0.81 0.434 Hand span 1.26 0.52 2.44 0.031 S=3.34 R-Sq 33.1%For a data set of weights (pounds) and highway fuel consumption amounts (mpg) of five types of automobile, the linear correlation coefficient is found and the P-value is 0.033. Write a statement that interprets the P-value and includes a conclusion about linear correlation. The P-value indicates that the probability of a linear correlation coefficient that is at least as extreme is nothing%, which is ▼ high, low, so there ▼ is not is sufficient evidence to conclude that there is a linear correlation between weight and highway fuel consumption in automobiles.
