The article “gas cooking, kitchen ventilation, and exposure to combustion products” reported that for a sample of 50 kitchens withgas cooking appliances monitored during a one-week period, the sample mean co2level(ppm) was 654.16, and the sample standard deviation was 164.43.(a) calculate and interpret a 95% confidence interval for true average co2level in thepopulation of all homes from which the sample was selected.(b) suppose the investigators had made a rough guess of 175 for the value ofsbeforecollecting data. what sample size would be necessary to obtain an interval widthof 50 ppm for a confidence level of 95%?

answer

the correct answer is

explanation

the given function is

the excluded values are obtained by solving:

we factor to obtain:

the excluded values are

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98