The mean blood sodium concentration of these 38 cases was 115 mmol/l, with standard deviation of 12 mmol/l. Assuming that blood sodium concentration is normally distributed what is the 95% confidence interval within which the mean of the total population of such cases may be expected to lie? (Table value = 1.96)

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  1. The mean blood sodium concentration of these 38 cases was 115 mmol/l, with standard deviation of 12 mmol/l. Assuming that blood sodium concentration is normally distributed what is the 95% confidence interval within which the mean of the total population of such cases may be expected to lie? (Table value = 1.96)
  2. In two wards for elderly women in a geriatric hospital the following levels of haemoglobin were found:

Ward A: 12.2, 11.1, 14.0, 11.3, 12.5, 12.7, 13.4, 13.7 g/dl;

Ward B: 11.9, 10.7, 12.3, 13.9, 11.4, 12.0, 11.1 g/dl.

 What is the 95% confidence interval for the difference in treatments?

(Table value = 2.16)

  1. Suppose that a market research firm is hired to estimate the percent of adults living in a large city who have not cell phones. Five hundred randomly selected adult residents in this city are surveyed to determine the results. Of the 500 people sampled, 421 responded that they own cell phones. Using a 95% confidence level, compute a confidence interval estimate for the true proportion of adult residents of this city who have not cell phones. (Table value = 1.96)
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