A researcher determines that students study an average of 80 +- 20 (MSD) minutes per week. Assuming these data are normally distributed, what is the z score for students studying 60 minutes per week? Show your work on the paper provided.
z-score = X - Mean / SD
For given, X = 60
z = 60 - 80 / 20
= -1
z-score = -1
A researcher determines that students study an average of 80 +- 20 (MSD) minutes per week....
A researcher determines that students study an average of 8020 (MSD) minutes per week. Assuming these data are normally distributed, what is the z score for students studying 60 minutes per week? Show your work on the paper provided.
A college professor determines that students who study an average of 4.34 ± 2.21 (M ± SD) hours per day do generally better on exams. Assuming these data are normally distributed, what is the z-score for students who study 6 hours per day? A. 0.48 B. 0.55 C. 0.63 D. 0.75
What is the relationship between the amount of time statistics students study per week and their final exam scores? The results of the survey are shown below. Time Score 3 67 13 95 6 15 77 89 13 100 3 66 7 63 11 79 1 59 a. Find the correlation coefficient: r = Round to 2 decimal places. b. The null and alternative hypotheses for correlation are: Ho: ? D = 0 H: ? *0 The p-value is: (Round...
What is the relationship between the amount of time statistics students study per week and their test scores? The results of the survey are shown below. Time 16 14 15 6 14 15 6 Score 100 89 100 68 99 100 78 x-values y-values Find the correlation coefficient: r=r= Round to 2 decimal places. The null and alternative hypotheses for correlation are: H0:H0: ? ρ r μ == 0 H1:H1: ? μ r ρ ≠≠ 0 The p-value is: (Round to four decimal...
What is the relationship between the amount of time statistics students study per week and their final exam scores? The results of the survey are shown below. Time Score 3 10 15 512 015 58 75 89 89 77 79 54 96 a. Find the correlation coefficient: r = Round to 2 decimal places. b. The null and alternative hypotheses for correlation are: Ho: ? - 0 H: 70 (Round to four The p-value is: decimal places) c. Use a...
What is the relationship between the amount of time statistics students study per week and their test scores? The results of the survey are shown below. Time 13 10 9 9 2 10 12 8 Score 84 83 90 76 74 86 99 85 x-values y-values Find the correlation coefficient: r=r= Round to 2 decimal places. The null and alternative hypotheses for correlation are: H0:H0: ? r ρ μ == 0 H1:H1: ? μ ρ r ≠≠ 0 The p-value is: (Round to...
What is the relationship between the amount of time statistics students study per week and their final exam scores? The results of the survey are shown below. Time 12 0 3 14 14 9 0 13 10 Score 95 60 73 85 86 89 65 97 93 Find the correlation coefficient: r=r= Round to 2 decimal places. The null and alternative hypotheses for correlation are: H0:H0: ? μ ρ r == 0 H1:H1: ? ρ μ r ≠≠ 0 The p-value is: (Round...
A student group claims that first-year students at a university should study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on the average. The skeptic randomly samples 55 students and determines that on average they study 82 minutes per night. What is the correct parameter of interest for this study? Select one: 82 minutes The 55 students in the study. First-year students at the university. The average number of...
Univeristy of Calagary's students average 60 hours of sleep per week. Sleep is a normally distributed variable with a standard deviation of 6 hours per week. Determine the amount of sleep that is exceeded by no more than 2.5% of students.
A questionnaire about study habits was given to a random sample of high school students. The sample of 20 students reported that they spent an average of 215 minutes per week studying with a standard deviation of 70 minutes. What is your 95% confidence interval on the population variance?