Note :- There is a correction in (C), below is a correction
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c)
Problem #6: The grade point averages (GPAs) of a large population of college students are approximately...
3) The grade point averages of a large population of college studenta is approximately normally distributed with mean 2.4 and standard deviation 0.8. What fruction of the students will possess a grade point average in excess of 3.0? 4) Refer to problem 3). If students possessing a grade point average lees than 1.9 are dropped from the college, what percentage of the students will be dropped?
The grade point averages (GPA) of 18 randomly selected college students are used to estimate the mean GPA of the college students. The GPAs from the sample are as follows: 2.3 3.3 2.6 1.8 0.2 3.1 4.0 0.7 3.1 2.3 2.0 3.1 3.4 1.3 2.6 2.6 3.7 2.2 (5 points) Is it justified to use of the standard normal distribution to construct the confidence interval? Explain. (10 points) If the population is assumed to be normally distributed, construct a 98% confidence interval for the population mean GPA. Show your work in detail and use 3...
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. Assume the population is normally distributed. 2.1, 3.1, 2.6, 1.5, 0.6, 4.0, 2.1, 1.1, 3.6, 0.5, 2.1, 3.4 construct a 90% confidence interval for the population mean The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) 2.1 below. 1.5 Assume the population is normally distributed. 2.1...
A professor obtains SAT scores and freshman grade point averages (GPAs) for a group of n15 college students. The SAT scores have a mean of M = 580 with SS 22,400, and the GPAs have a mean of 3.10 with SS = 1.26, and SP = 84. Find the regression equation for predicting GPA from SAT scores. (Use five decimal places for the slope.)
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below 2.5 34 2.6 1.9 0.5 4.0 2.2 1.2 3.8 0.2 2.3 3.1 Assume the population is normally distributed. (a) Find the sample mean. x(Round to two decimal places as needed) (b) Find the sample standard deviation. s(Round to two decimal places as needed.) (c) Construct a 95% confidence interval for the population mean A 95% confidence interval for...
The grade point averages of the students in a large statistics class follow a normal distribution with a mean of 3.0 and a standard deviation of 0.25. What is the probability that a randomly sampled student from this class has a GPA of less than 2.95? (hint: you will need to use the table on page 175)
Problem 7: The grade point averages (GPAs) for graduating seniors at a college are distributed as a continuous random variable X with pdf k(1-(-3)2) 2KIS4 otherwise (a) Find the value of k. (e) What is the expected value and variance of X?
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. Assume the population is normally distributed. 2.2 3.2 2.5 1.6 0.6 4.0 2.3 1.3 3.6 0.3 2.3 3.4 a) Find the sample mean. x overbar x equals= (Round to two decimal places as needed.) (b) Find the sample standard deviation. s equals= (Round to two decimal places as needed.) (c) Construct a 95% confidence interval for the population...
Wo e parts (a) The grade point averages (GPA) for 12 randomly selected college students are shown on the right Complet 0 0 1.6 0.8 40 2.1 1.1 3.5 0.4 2.4 3.3 through (c) below Assume the population is normally distributed (a) Find the sample mearn xRound to two decimal places as needed) (b) Find the sample standard deviation sRound to two decimal places as needed.) (c) Construct a 95% confidence interval for the population mean A 95% confidence interval...
The grade point averages (GPA) for 15 randomly selected college students are: 2.3 3.3 2.6 1.8 0.2 3.1 0.7 4.0 2.3 2.0 3.1 3.4 13 26 26 Which of the following is the correct confidence interval procedure for a 95% confidence level?