6. 6. For the following grouped frequency distribution table of exam scores, how many students had scoreslower than X = 75?Xf95-996.90-9485-89480-84575-7970-741а.2b.С.d.1

Answered: Image /qna-images/answer/ec3df191-8f36-4f23-94f3-f1d6fb139069.jpg

Answered: f 95-99 90-94 3 85-89 4 80-84 75-79 2…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.6: Summarizing Categorical Data

Problem 31PPS

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Similar questions

Find the mean hourly cost when the cell phone described above is used for 240 minutes.
5.
Mean of 100 observations is found to be 40. If at the time of computation two items are wrongly taken as 30 and 27 instead of 3 and 72, find correct Mean.
Mean in case of Missing Frequency . Calculate the number of students against the class 30-40 of the following data where X = 28 Marks: 0-10 10-20 20-30 30-40 40-50 No. of students: 50-60 12 18 27 ? 17
A sample of n = 15 scores ranges from a high of X = 11 to a low of X = 3. If these scores are placed in a frequency distribution table, how many X values will be listed in the first column?
A correlation of 0.7 was found between time spent studying and percentage on an exam. What is the proportion of variance in exam scores that can be explained by time spent studying? A. 0.30 ©0.49 B. 0.40 D. 0.70
2. An education researcher wishes to determine the extent of relationship of the results between the reading comprehension test (x) and the vocabulary test (y) among 12 students. The data shows the following values: Ex = 76, Ey = 119, Ex^2 = 678, Ey^2 = 1561, Exy = 724. What is the value of r? a. -0.11 b. -0.24 c. 0.25 d. 0.32 3. Given: X = 49, X = 52, s = 2.1. What is the coefficient of skewness (sk)? a. -4.29 b. -1.43 c. 1.43 d. 4.29 4. A survey of 40 men regarding their shoe sizes (x) and their heights (y) were obtained. What is the likely height of a man with a shoe size of 10 based on the obtained regression equation, y = 130.4+ 4.7x? a. 177.4 cm b. 182.1 cm c. 186.8 cm d. 190.3 cm
, (b) The sum of deviations of a certain number of observations measured from 4 is 72 and the sum of observations of the same value from 7 is –3. Find the number of observations and their mean.
COMPLETE ALL 5 STEPS TO ANSWER THE QUESTIONS. A researcher wants to know if feelings of general happiness vary by race? Their obtained frequencies are: White (very happy: 600; Pretty Happy: 1192; not too happy: 304) black (very happy: 111; Pretty Happy: 269; not too happy: 107) other (very happy: 95; Pretty Happy: 140; not too happy: 41) Column marginal (white: 2096; Black: 487; other: 276) row marginal (very happy: 806; pretty happy: 1601; not too happy: 452) N = 2859 Step 3: With α = .05, what is your critical score? a: 7.779 b: 9.488 c: 13.277 d: 18.467
For a certain frequency table which is partly réproduced here, the mean was found to be 1'46. No, of accidents Number of days 46 2 3 4 25 10 5 200 Calculate the missing frequencies.
Just the second part
By how many times does the sample size have to be increased to decrease the margin of error by a factor of one ninth? The sample size must be increased by a factor of to decrease the margin of error by a factor of one ninth. What is the general relationship if any between the sample size and the margin of error?

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f 95-99 90-94 3 85-89 4 80-84 75-79 2 70-74 1 а. 2 b. 3 С. d. 1