In a sample of n=20 what would be the student's t test statistic for a correlation of r=0.400?
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In a sample of n=20 what would be the student's t test statistic for a
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- Do high school students who have higher SAT scores will have higher grade point averages in college? For years, officers have been using SAT scores to place college students in certain classes their freshmen year. Now the admissions director wants to know if this policy is effective. You draw a random sample of 200 college sophomores and compare their SAT scores to their grade point average for their freshmen year. You calculate a Pearson’s r for correlations and receive a value of .254 between the two variables. You also calculate the significance of your findings (using a computer) and receive a significance value (p-value) of .000.In a short paragraph, based on the results from the correlation, what will you tell the admissions director? Ensure that you mention the direction of the relationship, the strength of the relationship, and whether your findings are statistically significant.A study was conducted to determine if the number of hours of sleep per night was related to exam performance on an exam taken the following day. The correlation coefficient was found to be .78. Which statement is FALSE? The relationship between hours of sleep and exam performance the following day is strong. As the number of hours of sleep increases, exam performance is also expected to increase at a similar rate. The r-value is .78. The number of hours of sleep cannot be used to estimate or predict possible performance on an exam the following day.In baseball, is there a linear correlation between batting average and home run percentage? Let x represent the batting average of a professional baseball player, and let y represent the player's home run percentage (number of home runs per 100 times at bat). A random sample of n = 7 professional baseball players gave the following information.
- In the previous problem, there was a correlation of .62 between hours spent playing video games and hand-eye coordination. What percent of the variance in hours spent playing video games is accounted for by hand-eye coordination? Group of answer choices .62 .05 cannot be determined from information given .38Is there sufficient evidence or not to conclude that there is a linear correlation between brain volume and IQ score in males ?For a random sample of households in the US, we record annual household income, whether the location is east or west of the Mississippi River, and number of children. We are interested in determining whether or not there is a linear relationship between household income and number of children. Part 1 (a) State the null and alternative hypotheses. Ho: II vs Ha: 44₁ :: p ₂ ^ P₁ p II :: P₁ A P₂ : 0 p
- A researcher obtained the following results for a study: n = 44, SSy = 340603, SSx = 33712, B̂ = 2.0025 Find the correlation for these results?Among a random sample of the stat's census deciles (a small geographic unit), there is a -0.90 correlation (p=.50) between school truancy rates and the rates of alcohol sales to minors. How would you characterize the relationship between truancy and alcohol sales to minors? A. We cannot be confident that there is a relationship between the two variables. B. We have evidence that there is a strong, positive correlation between the two variables. C. We have evidence that there is a strong, negative correlation between the two variables. D. We have evidence that there is a weak, positive correlation between the two variables. E. We have evidence that there is a weak, negative correlation between the two variables.An exercise scientist wants to know if there is a relationship between explosive leg power and standing jump height. To determine if a relationship exists, a group of 30 participants' (N = 30) Leg power was measured by recording each participants' single squat weight max (in pounds). Next, each participant was asked to perform a standing jump and their Jump height was recorded (in meters). Using the variables “Leg power” and “Jump height”, conduct a Pearson's Correlation, at α = 0.05, to determine if leg power and jump height are correlated. Identify the correct null hypothesis A. H0: There is no relationship between leg power and jump height B. H0: There is a relationship between leg power and jump height C. HA: There is a relationship between leg power and jump height D. HA: There is no relationship between leg power and jump height
- An exercise scientist wants to know if there is a relationship between explosive leg power and standing jump height. To determine if a relationship exists, a group of 30 participants' (N = 30) Leg power was measured by recording each participants' single squat weight max (in pounds). Next, each participant was asked to perform a standing jump and their Jump height was recorded (in meters). Using the variables “Leg power” and “Jump height”, conduct a Pearson's Correlation, at α = 0.05, to determine if leg power and jump height are correlated. What does this type of correlation indicate about how leg strength and jump height change together? A. Both leg strength and jump height increase and decrease together B. There is no relationship between leg strength and jump height C. As leg strength increases, jump height decreases D. As jump height increases, leg strength decreasesYou run a PPM correlation on sprint speed and vertical jump height in NFL running backs and find an r value of 0.89. Your sample has a mean sprint speed of 11 m/s ± 0.3 m/s and a mean jump height of 0.49 m ± 0.3 m. What is the effect size estimate? 2.96 0.89 -35.033 35.033 0.267You may need to use the appropriate appendix table or technology to answer this question. To test whether the mean time needed to mbx a batch of material is the same for machines produced by three manufacturers, a chemical company obtained needed to mix the materlal. Manufacturer 21 28 19 25 26 18 24 31 22 22 31 21 Usn Fisher's LSo procedure to develop a 95% confidence interval estimate (in minutes) of the difference between the means for manufacturer 1 and manufactu places.) min to min
