A survey of college students was conducted during final exam week to assess the number of cups of coffee consumed each day
A survey of college students was conducted during final exam week to assess the number of hours spent studying each day. The mean number of hours was 5 with a standard deviation of 1.5 hours. The distribution was normal. How many hours would an individual at the 60th percentile rank study?
fee? 5) Amon g coffee drinkers, men drink a mean of 3.4 cups per day with a standard deviation of 0.8 cup. Assum distribution. e the number of cups per day follows a normal a. What proportion drinks 2 cups per day or more? b. What proportion drinks no more than 4 cups per day?
What proportion of college students drink coffee every day? A 99% confidence interval for the proportion of college students who say they drink coffee every day was constructed and it was found to be from 0.38 to 0.52. Based on this interval, we know the margin of error must be A 0.07. B 0.01. C 0.14. D It’s impossible to answer this question without more information. E 0.03.
2. The average number of cups of coffee drunk each day by a randomly selected sample of 25 students was 4.4. Assume the population standard deviation is 0.5 cups of coffee. Does the sample provide enough statistical evidence to support a claim that students drink 4 cups of coffee per day on average? Test the hypothesis at a 1% level of significance. Perform a 1-sample Z-test of mean to assess the sample evidence. A. State the null and alternative hypotheses...
A student at a junior college conducted a survey of 20 randomly selected full-time students to determine the relation between the number of hours of video game playing each week, x, and grade-point average, y. She found that a linear relation exists between the two variables. The least squares regression line that describes this relation is ģ= -0.0564x + 2 9482 (a) Predict the grade-point average of a student who plays video games 8 hours per week. The predicted grade...
1. To determine the average number of hours spent studying by college students per week, a sample of 39 students was randomly selected, and found to spend an average of 17.1 hours per week, with a standard deviation of 4.3 hours. Find the 90% confidence interval for the mean number of hours spent studying per week by all college students. What is the upper and lower bound? 2. If I asked a random student how many hours they study per...
A recent survey asked college students how much time they spend studying each week. The results showed a mean of 10 hours with a standard deviation of 2 hours. Complete parts (a) through (c) below. (a) Find the probability that a randomly selected student would spend less than 7 hours studying per week. O A. 0.933 OB. 0.500 OC. 0.067 OD. 0.333 (b) What percent of students spend more than 12 hours studying per wook? O A. 80.0% OB. 15.9%...
Page 3 of 18 MyOpenMath Assessment 6.48 Coffee and Depression: Researchers conducted a study investigating the relationship between caffeinated coffee consumption and risk of depression in women. They collected data on 50,739 women free of depression symptoms at the start of the study in the year 1996, and these women were followed through 2006. The researchers used questionnaires to collect data on caffeinated coffee consumption, asked each individual about physician-diagnosed depression, and also asked about the use of antidepressants. The...
Winter 2018 AT 103 Test II Chapters 6-11 a( \ 1. The average number of miles that 90 truckers drove in a day was 540 with a standard what is the 99% confidence interval of the true mean number of deviation of 40 miles, miles driven by all truckers? Dr. Christina Cuttleman, a nutritionist, claims that the average number ofcalories in a serving of popcorn is 75 with a standard deviation of 7. A sample of 50 servings of popcorn...
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...