Ans:
a)sample mean=2.31
b)
s=1.21
c)n=12-1=11
critical t value=tinv(0.05,11)=2.201
Margin of error=2.201*(1.21/sqrt(12))=0.77
lower limit=2.31-0.77=1.54
Upper limit=2.31+0.77=3.08
The grade point averages (GPA) for 12 randomly selected college students are shown on the right....
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...
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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...
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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...
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need answer not formulas question#1 question#2 question#3 his Question: 1 pt 10 of 20 (0 complete) This Test: 20 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 noemaly distributed 3.4 0.9 1.3 2.3 2.7 5 4.0 3.8 3.4 1.9 2.4 0.3 (a) Find the sample mean xs[](Round to two decimal places as. needed.) b) Find the sample standard deviation Round to twro...
(a) Find the sample mean (b) Find the sample standard deviation (c) Construct a 99% confidence interval for the population mean μ. The numbers to the right are 2.4, 1.6, 2.3, 0.4, 3.4, 0.9, 1.1, 2.3, 2.6, 4.0, 3.8, 3.2 6.2.26-T Question Help The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below. 2.4 3.4 2.6 1.6 0.9 4.0 Assume the population is normally distributed. 2.3 1.1 3,8...
The following data are the monthly salaries y and the grade point averages x for students who obtained a bachelor's degree in business administration. GPA 2.6 3.4 3.6 3.1 3.4 3.1 Monthly Salary ($) 3,500 3,800 4,200 3,800 4,100 2,500 The estimated regression equation for these data is y 914.5 854.8x and MSE 360,484. a. Develop a point estimate of the starting salary for a student with a GPA of 3.0 (to 1 decimal). b. Develop a 95% confidence interval...