The numbers of hours worked (per week) by 400 statistics students are shown below.
Number of hours | Frequency | Cumulative Frequency |
---|---|---|
0 - 9 | 20 | 20 |
10 - 19 | 80 | 20 + 80 = 100 |
20 - 29 | 200 | 100 + 200 = 300 |
30 - 39 | 100 | 300 + 100 = 400 |
Total = 400 |
Therefore, the cumulative percent frequency for hours is
300
The numbers of hours worked (per week) by 400 statistics students are shown below. Number of...
Question 2 The sumbers of hours worked (per week:) by 400 statistics students are shown below Number of hours 0-9 10 -19 20-29 30-39 Frequency 20 80 200 100 The class width used in this frequency distribution is O a. 9 b.10 О с. 39 O d. 4.5
Suppose we want to estimate the difference between the average number of hours worked per week by all Americans with a college degree and those without a college degree. Summary information for each group is shown in the tables. 200 College degree 100 20 80 250 No college degree 50 80 Hours worked per week Statistic College Degree No College Degree Mean42.5 hours SD 39.1 hours 14.9 hours 14.7 hours 467 646 1. Create a 95% confidence interval for the...
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...
A researcher has obtained the number of hours worked per week during the summer for a sample of fifteen students. 40 25 35 30 20 40 30 20 40 10 30 20 10 5 20 Using this data set, compute the a. median b. mean c. mode d. 40th percentile e. range f. sample variance g. standard deviation
Assume that the number of hours college students spend working
per week is normally distributed with a mean of 18 hours and
standard deviation of 4 hours
2. Assume that the number of hours that college students spend working per week is normally distributed with a mean of 18 hours and a standard deviation of 4 hours. a. Mark the 7 hash marks on the x-axis with the appropriate labels in hours worked per week. Recall that the center hash...
Twenty students were asked how many hours they worked per day. Work Hours Frequency Relative Frequency Cumulative Relative Frequenc)y a. (396) Complete table (fill in relative frequency and cumulative relative frequency columns) b. (396) Construct histogram 0.00 0.00 0.00 .00 0.00 0.00 10 4 4 7 C. (396) Complete the box and whiskers plot B CD d. (396) Calculate the sample mean: x- e. (3%) What percentage of students worked three hours or less per day? (Enter only a number....
1. The number of hours per week that 200 college students spend on the Internet is grouped into classes (0 − 3),(4 − 7),(8 − 11),(12 − 15),(16 − 19),(20 − 23),(24 − 27) with observed frequencies of 12, 25, 36, 45, 34, 31, and 17. The grouped mean and standard deviation are found from the data. The null hypothesis is that the data is normally distributed. Using the mean and standard deviation, the expected frequencies are found to be...
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...
FCU students are surveyed about their favorite day of the week to take a class excluding Fridays and weekends. Results are below. Rating Number Percent Cumulative % Cumulative Frequency Valid % Monday 10 Tuesday 25 Wednesday 20 Thursday 50 No Preference 30 a) Complete the percent, cumulative frequency, cumulative percent, and valid percent columns AND the “total” row above. (1 each cell) b) Of those noting an opinion, what percent were preferred Wednesday or Thursday ? c) How many students...
The following frequency distribution represents the number of hours studied per week by a sample of 50 students. Picture Refer to Exhibit 3-8. The standard deviation of the number of hours studied is: 1.89. 2.79. 3.50. 3.56. hours studied midpoint frequency 2.5 less than 5.5 4 5 5.5 less than 8.5 7 30 8.5 less than 11.5 10 25