H0: μ = 8
H1: μ > 8

t = (8.25 - 8)/(0.8/sqrt(28)) = 1.654
t_table = 1.703

since t_calc < t_table, we accept H0, and conclude that the sample does not provide cnvincing evidence that the fertilizer had a positive impact on the weight of the corn ears at 0.05 level of significant.

4 0

3 years ago

Due in 10 minutes please help !! ASAP Erin buys 2 packs of potatoes costing £2 each, 3 packs of carrots for £3 per pack, and 3 t

lions [1.4K]

2(2) + 3(3) =

4 + 9 = 13

I don't know what 90p means but basically, u have to multiply that by 3 and add it to our current total which is 13.

Then, u substract the total cost from the 20 and you should get the change.

6 0

3 years ago

Find the area of polygon

Mumz [18]

Answer:

87 cm²

Step-by-step explanation:

there is 1 triangle and 1 rectangle in the diagram. so you have to find the area of the both polygons and sum up to find the total area of polygon

area of triangle formula:

$\frac{1}{2} \times base \times height$

1) area of triangle AED

base = 12 cm

height = 4.5 cm

area:

$\frac{1}{2} \times 12 \times 4.5 = 27 {cm}^{2}$

area of rectangle formula:

$length \times height$

2) area of rectangle ABCD

length = 12cm

height = 5 cm

area:

$12 \times 5 = 60 \: cm {}^{2}$

3) area of whole polygon

= area of triangle AED + area of rectangle ABCD

= 27 cm² + 60 cm²

= 87 cm²

7 0

3 years ago

A researcher believes that female stray cats are more cautious when approaching people than male cats. He knows that the stray c

Ierofanga [76]

Answer:

Step-by-step explanation:

Researcher observes that 12 out 15 cats that approached him are males.

Therefore, number of Female Cats that approached him = 15 – 12 = 3

5 0

3 years ago