For each of the following variables indicate whether you would expect a positive correlation, a negative correlation, or no correlation.

(a) Maximum daily temperature and cooling costs(b) Interest rate and number of loan applications(c) incomes of husbands and wives when both have full time jobs(d) height and IQ(e) height and shoe size(f) score on the math section of the SAT exam and score on the verbal section of the same test(g) the time spent on homework and time spent watching television during the day by elementary school children(h) amount of fertilizer used per acre and crop yield

a) positive correlation: the higher the daily temperature the higher the cooling cost

b) negative correlation: interest rate will gradually reduce over time with increasing number of loan applications from and individual provided the individual met the necessary terms for the previous loans

c) positive corellation: husbands and wives income will increase with a more stable full time job.

d) no correlation: no correlation exist between heights of individuals and their IQ

e) positive correlation: tall individuals statistically have larger feet when compared to shorter individuals, this translates to bigger shoe sizes for taller folks

f) no correlation: an individual doing well in SAT maths does not say anything about how well they will perform in the verbal reasoning section. Different students have different strength and weaknesses for different subjects.

g) negative correlation: the longer the time spent doing homework during the day, the shorter the time available for watching TV during the day for elementary school students.

h) positive correlation: the more the fertilizers applied to a farmland the more the expected yield. provided harmful level of application is not reached.

the correct answer is b) histograms can be used to exhibit the shape of distributions. this is because histograms count the frequency of each possible answer, so one is able to see which results are more common and which are less common.

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.