Because couples are deciding to have fewer children, the family size of the United States has declined continuously during the past few decades. According to the U. S. Bureau of the Census, the mean family size was 3.19 with a standard deviation of 0.70 in 1995. A researcher wanted to check if the current mean family size is less than 3.19. A sample of 900 families taken this year by this researcher produced a mean family size of 3.16. Using the .025 significance level, can we conclude that the mean family size has declined since 1995

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

5x+10 is the correct one

hope this

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x