The following table displays descriptive statistics on the participants involved

Question

The following table displays descriptive statistics on the participants involved in the study described in Problem. New Compound Placebo p-value Characteristic Mean Age, years % Males Mean Educational Level, years Mean Annual Income, $000s Mean Body Mass Index 47.2 44% 13.1 $36,560 24.7 46.1 59% 14.2 $37470 0.7564 0.0215 0.6898 0.3546 0.0851 25.1 Are any of the characteristics significantly different between groups? Justify briefly. (Hint: No calculations, just interpret above.) A study is run to estimate the mean total cholesterol level in children 2-6 years of age. A sampl of 9 participants is selected and their total cholesterol levels are measured as follows. 2. ib hotob i olgni 185 225 240 16175180 194 147 223 Using Excel, calculate descriptive statistics for this sample. Make sure to include summary statistics and a 95% confidence level. a. b. c. Using the confidence level, calculate the 95% confidence of this sample. In words, what does this interval mean?

Explanation / Answer

Solution 1):

At 5% level % Males Characteristics is significant and Mean Annual Income, $000s.

At 10% Level Mean Body Mass Index is significant  

So this shows Mean Age, years and Mean Educational Level, years are not significant as they are above 10 % level of significance.

Solution 2 a)

Descriptive Statistics for the sample ,Summary Statistics and a 95 % Confidence Level by using Excel

Mean= 196.11

Standard Error = 9.67

Median = 194

Mode = #N/A

Standard Deviation =29

Sample variance = 841.11

Kurtosis = -0.40

Skewness = -0.04

Range = 93

Minimum = 147

Maximum = 240

Sum = 1765

Count = 9

Confidence Level (95%) = 22.29

Solution 2b):

x±t s/n

= 196.1± (2.306) 29/9

= 196.1 ± 22.29 = (173.8,218.4)

Solution 2 C)

Interval Mean: This means to compute a confidence interval on the mean, i.e. compute the mean of a sample in order to estimate the mean of the population.

  

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