People gain weight when they take in more energy from food than they expend. Some researchers...

People gain weight when they take in more energy from food than they expend. Some researchers wanted to investigate the link between obesity and energy spent on daily activity. Choose 20 healthy volunteers who don't exercise. Deliberately choose 10 who are lean and 10 who are mildly obese but still healthy. Attach sensors that monitor the subjects' every move for 10 days. The table below presents data on the time (in minutes per day) that the subjects spent standing or walking, sitting, and lying down. It can be concluded that mildly obese people spend less time standing and walking (on the average) than lean people. Is there a significant difference between the mean times the two groups spend lying down? Use the four-step process to answer this question from the data. (Let μ1 be the mean time spent lying down by the lean group, and μ2 be the mean time for the obese group.)

Time (minutes per day) spent in three different postures by lean and obese subjects
Group	Subject	Stand/Walk	Sit	Lie
Lean	1	516.100	366.300	553.500
Lean	2	612.925	378.512	449.650
Lean	3	314.212	581.138	540.362
Lean	4	589.644	354.144	486.269
Lean	5	575.869	347.994	519.081
Lean	6	543.388	389.312	509.500
Lean	7	676.188	264.188	462.700
Lean	8	552.656	325.219	565.006
Lean	9	379.831	534.031	528.431
Lean	10	505.700	526.838	396.962
Obese	11	262.244	648.281	525.044
Obese	12	469.756	451.644	510.931
Obese	13	371.138	575.662	563.300
Obese	14	410.667	574.662	527.208
Obese	15	345.375	579.662	507.931
Obese	16	421.531	570.556	443.856
Obese	17	353.650	617.262	460.550
Obese	18	272.344	641.181	511.981
Obese	19	415.631	570.769	447.706
Obese	20	423.356	589.369	410.919

SOLVE:

Find the size, mean and standard deviation of each group. (Round your means and standard deviations to four decimal places.)

	n	x	s
Lean
Obese

Expert Solution

Using Minitab:

Choose Stat > Basic Statistics > Display Descriptive Statistics.
In Variables, enter 'Stand/Walk' Sit Lie
In By variables (optional), enter Group

Click OK in each dialog box

Hope this will be helpful. Thanks and God bless you :)

orchestra answered 2 years ago

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