Homework Answers
26) option B
27) first option 0.6424
because p( -0.92<z<0.92) = 0.6424
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Ateacher asked 12 students how many hours they had spent preparing for a test. The results...
An instructor asked five students how many hours they had studied for an exam, with the...
An instructor asked five students how many hours they had studied for an exam, with the accompanying results. Complete parts (a) through (d) below. Click the icon to view the paired scores for hours studied and test grade. (a) Make a scatter diagram of the scores. Choose the correct answer below. OB Oc. OD OA So 100 As Q a 100 12- Test Gede ther 0 You 0 100 Test Grade 0 100 Test Grade Hours de Hours Studied WW...
Question 1. Thirty graduate students were asked how many credit hours they were taking in the...
Question 1. Thirty graduate students were asked how many credit hours they were taking in the current quarter. Download the available data: Calculate the mean, median, standard deviation, variance, and range for this sample using Excel. Write a sentence explaining what each measure means. What is the standard error of the mean based on the data? What would be the best point estimate for the population credit hours? (“Population” refers to all graduate students’ credit hours in the universe.) What...
11. Consider the following histogram of IQ scores of 7th graders. How many total students were...
11. Consider the following histogram of IQ scores of 7th graders. How many total students were included in the study?: * IQ's of 7th Graders 100 Frequency 60 0 20 90-99 120-129 100-109 110-119 Score Interval a. 240 Ob. 200 Oc. 180 Od. 300 12. Compute the sample standard deviation for (4, 5, 5, 6, 7, 7, 9, 9, 10, 12).: * O a. 0.8222 Ob. 0.8889 Oc. 2.2926 Od. 2.5473 Questions 13-14: The following table displays the number of...
A sample of college students was asked how much they spent monthly on pizza. Approximate the...
A sample of college students was asked how much they spent monthly on pizza. Approximate the standard deviation for the cost. Monthly pizzapizza cost ($) Number of students 10.00-19.99 9 20.00-29.99 14 30.00-39.99 26 40.00-49.99 15 50.00-59.99 5 The sample standard deviation for the cost is (Round to the nearest cent as needed.)
UTRGV female and male students were asked how much time they spent watching TV each week....
UTRGV female and male students were asked how much time they spent watching TV each week. Researchers would like to know if there is a difference between the time males and females spend watching TV. (α = .05) Men Women 10 13 15 3 6 5 8 7 20 9 12 4 a) What is the t-observed for the difference between the means? b) What is the p-value c) Based on the p-value and alpha, is there a statistically significant...
Question 21 Random sample of college students were asked how many hours they spent studying per...
Question 21
Random sample of college students were asked how many hours they spent studying per day. The results summarized by sex are given in the following table. Hours Spent Studying Less than 3 3 or more Total Males 36 64 100 Females 12 56 68 Total 48 120 168 Do these data provide evidence at the 0.01 level of significance to conclude that sex and amount of time spent studying are dependent? Begin by filling in the following tables....
A sample of 200 college freshmen was asked how many hours per week they spent playing...
A sample of 200 college freshmen was asked how many hours per week they spent playing video games. The following frequency distribution presents the results. Number of Hours Frequency 1.0- 3.9 20 4.0- 6.9 32 7.0- 9.9 47 10.0- 12.9 28 13.0- 15.9 24 16.0- 18.9 18 19.0- 21.9 12 22.0- 24.9 7 25.0- 27.9 4 28.0- 30.9 8 1) What is the class width? 2) What percentage of students play video games for less than 19 hours per week?...
Suppose a survey of 24 people asked how many books they have read in 2018. The...
Suppose a survey of 24 people asked how many books they have read in 2018. The results are shown in the table below. Number of Books Read 4 3 8 15 10 0 5 5 7 6 7 1 8 3 3 1 6 2 0 3 7 12 20 2 Step 3 of 7: Which is a better measure of center for this data? Why? Give the 5 Number Summary of this data. What is the interquartile range (IQR)...
A recent survey asked college students how much time they spend studying each week. The results...
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%...
A random sample of 15 college students were asked "How many hours per week typically do...
A random sample of 15 college students were asked "How many hours per week typically do you work outside the home?" Their 13 responses are shown on the right 31 13 Determine the shape of the distribution of hours worked by drawing a frequency histogram and computing the mean and median 18 Which measure of central tendency better describes hours worked? 16 18 25 28 20 24 15 Choose the correct frequency histogram below Hours Worked per Week OA Hours...
An instructor asked five students how many hours they had studied for an exam, with the accompanying results. Complete parts (a) through (d) below. Click the icon to view the paired scores for hours studied and test grade. (a) Make a scatter diagram of the scores. Choose the correct answer below. OB Oc. OD OA So 100 As Q a 100 12- Test Gede ther 0 You 0 100 Test Grade 0 100 Test Grade Hours de Hours Studied WW...
11. Consider the following histogram of IQ scores of 7th graders. How many total students were included in the study?: * IQ's of 7th Graders 100 Frequency 60 0 20 90-99 120-129 100-109 110-119 Score Interval a. 240 Ob. 200 Oc. 180 Od. 300 12. Compute the sample standard deviation for (4, 5, 5, 6, 7, 7, 9, 9, 10, 12).: * O a. 0.8222 Ob. 0.8889 Oc. 2.2926 Od. 2.5473 Questions 13-14: The following table displays the number of...
Question 21
Random sample of college students were asked how many hours they spent studying per day. The results summarized by sex are given in the following table. Hours Spent Studying Less than 3 3 or more Total Males 36 64 100 Females 12 56 68 Total 48 120 168 Do these data provide evidence at the 0.01 level of significance to conclude that sex and amount of time spent studying are dependent? Begin by filling in the following tables....
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%...
A random sample of 15 college students were asked "How many hours per week typically do you work outside the home?" Their 13 responses are shown on the right 31 13 Determine the shape of the distribution of hours worked by drawing a frequency histogram and computing the mean and median 18 Which measure of central tendency better describes hours worked? 16 18 25 28 20 24 15 Choose the correct frequency histogram below Hours Worked per Week OA Hours...
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