An investor has an account with stock from two different companies. Last year, her stock in Company A was worth
$1400 and her stock in Company B was worth $7100. The
stock in Company A has decreased 5% since last year and
the stock in Company B has decreased 9%. What was the
total percentage decrease in the investor's stock account?
Round your answer to the nearest tenth (if necessary).

Aresearch study is studying the effects of a new drug for osteoporosis alzheimer's disease (ad) for women above the age of 65 years. a group of individuals with osteoporosis is randomized into two groups. one group is treated conventionally, and the second group is treated with the new medication. assessments are made at 3, 6, 12, 36, and 48 months. the conventionally treated group is assessed for ad using a serum blood test, and the treatment group is assessed for ad using a pet radiotracer that binds to beta-amyloid plaques. in comparing these 2 trial arms, the authors of the study may encounter which type of bias? a. selection bias on the risk of developing b. measurement bias c. confounding bias d. recall bias e. lead-time bias