Over the last four months, the number of building blocks sold to parents of preschoolers increased. during the same time period, the number of educational videos sold increased as well. which of the following would be a valid conclusion?
a.
there are more parents with preschoolers than there are parents with children of other ages.

b.
educational videos were purchased to be used with the building blocks.

c.
building blocks were purchased to be used with the educational videos.

d.
the sales of building blocks and educational videos are not related; therefore there is no correlation.

Interpretation:

B.

Why?

I think it is B. because you can buy the building blocks first, and then find an educational video about the blocks. I hope this helps!

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

3/5

step-by-step explanation:

double number line is not a standard concept, so it must have been defined in your textbook. assume top line is numerator.