Accepted characters

: numbers, decimal point markers (period or comma), sign indicators (-), spaces

(e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).

NOTE:

For scientific notation,

a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.

The personnel department of a large corporation wants to estimate the family dental expenses of its

employees to determine the feasibility of providing a dental insurance plan. A random sample of 12

employees reveals the following family dental expenses (in dollars): 115, 370, 250, 593, 540, 225, 177,

425, 318, 182, 275, and 228.

Construct a 97% confidence interval estimate for the standard deviation of family dental expenses for all

employees of this corporation.

Place your LOWER limit, in dollars rounded to 1 decimal place, in the first blank. Do not use a dollar sign,

a comma, or any other stray mark. For example, 123.4 would be a legitimate entry. ________

Place your UPPER limit, in dollars rounded to 2decimal places, in the second blank. Donotuse a dollar sign, a comma, or any other stray mark. For example, 567.89 would be a legitimate entry.______