Homework Answers
We find the means and standard deviations for the samples using
Excel function Average and stdev.s
we get
| Sample 1 | Sample 2 | |
| Sample Size | n1 = 10 | n2 = 12 |
| Sample Mean | X̅1 = 76.4 | X̅2 = 72.33 |
| Sample Standard Deviation | s1 = 5.8348 | s2 = 6.3437 |
Since population standard deviation is not known, we use the t
distribution
Confidence interval is given by
For 95%, α = 0.05
Degrees of freedom = df = n1 + n2 - 2 = 10 + 12 - 2 =
20
From the t-tables, or Excel function T.INV.2T(α,
df)
t = T.INV.2T(0.05, 20)
t = 2.086
95% confidence interval for difference in means is
= 4.07 ± 5.4228
= (-1.3528, 9.4928)
95% confidence interval for μ1 - μ2 is (-1.3528,
9.4928)
Add Answer to:
Assume that o1 02 a. Sample 1: 80, 80, 79, 81, 76, 66, 71, 76, 70,...
Consider the below matrixA, which you can copy and paste directly into Matlab.
Problem #1: Consider the below matrix A, which you can copy and paste directly into Matlab. The matrix contains 3 columns. The first column consists of Test #1 marks, the second column is Test # 2 marks, and the third column is final exam marks for a large linear algebra course. Each row represents a particular student.A = [36 45 75 81 59 73 77 73 73 65 72 78 65 55 83 73 57 78 84 31 60 83...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
Use the accompanying data set on the pulse rates (in beats per minute) of males to...
Use the accompanying data set on the pulse rates (in beats per minute) of males to complete parts (a) and (b) below. LOADING... Click the icon to view the pulse rates of males. a. Find the mean and standard deviation, and verify that the pulse rates have a distribution that is roughly normal. The mean of the pulse rates is 71.871.8 beats per minute. (Round to one decimal place as needed.) The standard deviation of the pulse rates is 12.212.2...
Use this set of 40 exam scores as the POPULATION for this activity: (put them into...
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Gender HeartRate male 70 male 71 male 74 male 80 male 73 male 75 male 82...
Gender HeartRate
male 70
male 71
male 74
male 80
male 73
male 75
male 82
male 64
male 69
male 70
male 68
male 72
male 78
male 70
male 75
male 74
male 69
male 73
male 77
male 58
male 73
male 65
male 74
male 76
male 72
male 78
male 71
male 74
male 67
male 64
male 78
male 73
male 67
male 66
male 64
male 71
male 72
male 86
male 72...
Please compute your z -don't use a package State your conclusion in plain English - not...
Please compute your z -don't use a package State your conclusion in plain English - not just rejection 1 Students in the online class are suspicious that their schools 60 point loss may have caused their teacher to take out his frustration on the students by giving them a harder than usual exam. They manage to hack into his computer and get the following data: Scores for test Nov 2011 71 74 64 77 58 72 73 79 50 78...
Paste Font Alignment Number fc AVERAGE(A2:A6) A8 1 MALE FEMALE 123.4 132.8 68.8 121.8 73.8 33.1 53.1 78.1 55.5 81.2 4 104.12 MALE 83 120 98 116 76 70 98 FEMALE 85 65 69 61 62 81 81 60 70 87 82...
Paste Font Alignment Number fc AVERAGE(A2:A6) A8 1 MALE FEMALE 123.4 132.8 68.8 121.8 73.8 33.1 53.1 78.1 55.5 81.2 4 104.12 MALE 83 120 98 116 76 70 98 FEMALE 85 65 69 61 62 81 81 60 70 87 82 72 19 90 76 79 71 60 78 73 64 73 78 60 68 Male Avg- 93.56 Female Avg- 69.35 1) Assume the cut-score (passing point) = 80 2) Calculate the percentage of each group passing 3) Calculate...
1. Forecast demand for Year 4. a. Explain what technique you utilized to forecast your demand....
1. Forecast demand for Year 4.
a. Explain what technique you utilized to forecast your
demand.
b. Explain why you chose this technique over others.
Year 3 Year 1 Year 2 Actual Actual Actual Forecast Forecast Forecast Demand Demand Demand Week 1 52 57 63 55 66 77 Week 2 49 58 68 69 75 65 Week 3 47 50 58 65 80 74 Week 4 60 53 58 55 78 67 57 Week 5 49 57 64 76 77...
x Refer to the accompanying data set and construct a 90% confidence interval estimate of the...
x Refer to the accompanying data set and construct a 90% confidence interval estimate of the mean pulse rate of adult females, then do the same for adult males. Compare the results. Click the icon to view the pulse rates for adult females and adult males. Pulse Rates Construct a 90% confidence interval of the mean pulse rate for adult females. | bpm<<bpm (Round to one decimal place as needed.) Pulse Rates (beats per minute) e Construct a 90% confidence...
Gender HeartRate
male 70
male 71
male 74
male 80
male 73
male 75
male 82
male 64
male 69
male 70
male 68
male 72
male 78
male 70
male 75
male 74
male 69
male 73
male 77
male 58
male 73
male 65
male 74
male 76
male 72
male 78
male 71
male 74
male 67
male 64
male 78
male 73
male 67
male 66
male 64
male 71
male 72
male 86
male 72...
Please compute your z -don't use a package State your conclusion in plain English - not just rejection 1 Students in the online class are suspicious that their schools 60 point loss may have caused their teacher to take out his frustration on the students by giving them a harder than usual exam. They manage to hack into his computer and get the following data: Scores for test Nov 2011 71 74 64 77 58 72 73 79 50 78...
Paste Font Alignment Number fc AVERAGE(A2:A6) A8 1 MALE FEMALE 123.4 132.8 68.8 121.8 73.8 33.1 53.1 78.1 55.5 81.2 4 104.12 MALE 83 120 98 116 76 70 98 FEMALE 85 65 69 61 62 81 81 60 70 87 82 72 19 90 76 79 71 60 78 73 64 73 78 60 68 Male Avg- 93.56 Female Avg- 69.35 1) Assume the cut-score (passing point) = 80 2) Calculate the percentage of each group passing 3) Calculate...
1. Forecast demand for Year 4.
a. Explain what technique you utilized to forecast your
demand.
b. Explain why you chose this technique over others.
Year 3 Year 1 Year 2 Actual Actual Actual Forecast Forecast Forecast Demand Demand Demand Week 1 52 57 63 55 66 77 Week 2 49 58 68 69 75 65 Week 3 47 50 58 65 80 74 Week 4 60 53 58 55 78 67 57 Week 5 49 57 64 76 77...
x Refer to the accompanying data set and construct a 90% confidence interval estimate of the mean pulse rate of adult females, then do the same for adult males. Compare the results. Click the icon to view the pulse rates for adult females and adult males. Pulse Rates Construct a 90% confidence interval of the mean pulse rate for adult females. | bpm<<bpm (Round to one decimal place as needed.) Pulse Rates (beats per minute) e Construct a 90% confidence...
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