1)in a sample of 100 households, the mean number of hours spent on social networking sites during the month of january was 50 hours. in a much larger study,
the standard deviation was determined to be 6 hours.
assume the population standard deviation is the same. what is the 98% confidence interval for the mean hours devoted to social networking in january?

2)two studies were completed in florida. one study in northern florida involved 2,000 patients; 64% of them experienced flu-like symptoms during the month of december.
the other study, in southern florida, involved 3,000 patients;
54% of them experienced flu-like symptoms during the same month. which study has the smallest margin of error for a 95% confidence interval?

Browning labs is testing a new growth inhibitor for a certain type of bacteria. the bacteria naturally grows exponentially each hour at a rate of 6.2%. the researchers know that the inhibitor will make the growth rate of the bacteria less than or equal to its natural growth rate. the sample currently contains 100 bacteria. the container holding the sample can hold only 300 bacteria, after which the sample will no longer grow. however, the researchers are increasing the size of the container at a constant rate allowing the container to hold 100 more bacteria each hour. they would like to determine the possible number of bacteria in the container over time. create a system of inequalities to model the situation above, and use it to determine how many of the solutions are viable.

Question b of 10which of the following describe an angle with a vertex at a? check all that applyo a. labcов. савd dooo c_baco d. zacb

00 points ! missy’s rotation maps point k(17, –12) to k’(12, 17). which describes the rotation? 270° counterclockwise rotation 90° counterclockwise rotation 90° clockwise rotation 180° rotation