Question

can some one help me i will give them a medal and fan them

Answer 1

Noted scientist Dr. Elsa Birde described the effect of adding a mixture of dried apples and raisins to the previous feed of sunflower seeds, millet, thistle seed, and cracked corn in bird feeders in her yard. Over three years, Dr. Birde observed that the new mixture increased the number of songbirds at her feeders, especially during the months of April and May. As she has done for several years, Dr. Birde recorded, at the same time each day, the number of birds at each of her four feeders. She noted that the third year using the mixture coincided with the largest increase. There was a twenty-five percent increase in the number of songbirds over times when this mixture was not used. Dr. Birde also noted that in the third year she used a specific ratio of the ingredients, carefully measuring, which she had not done in previous years. The third year also had a warmer than normal spring, and a construction project began in a neighborhood near Dr. Birde’s. Dr. Birde is now going to produce this formula for sale and advertise to customers that they may see the same twenty-five percent increase in songbirds at their feeders.
Dr. E. Birde, Journal of Scientific Bird Feeding

Which might be a cause for the increase in songbirds at the feeders?
the time of day that the birds were counted at the feeders
the addition of dried apples and raisins to the formula
the temperature changes each year
the increased number of bird feeders

Answer 2

"She noted that the third year using the mixture coincided with the largest increase..
There was a twenty-five percent increase in the number of songbirds over times when this mixture was not used." is this a typo? using the mixture increased the number of birds visiting the cages but then it says there was an increase when the mixture was not used?

Answer 3

@Cuanchi

Answer 4

a,b,c or d

Answer 5

if there is not a typo

There was a twenty-five percent increase in the number of songbirds over times when this mixture was not used.

looks like the increase of 25% every year was independent of the mix

then the increase in the third year will be by the increase of temperature or the construction project that began in a neighborhood?

Answer 6

http://assets.openstudy.com/updates/attachments/54431822e4b0fc269081a2c4-tuta-1413684846176-khkjhkhkkk.png

Answer 7

this question was asked before here and the conclusion was similar but the student posted the answer was not correct
http://openstudy.com/study#/updates/54431822e4b0fc269081a2c4