Stacy recorded the number of minutes she used her smartphone each day for one week before using an app that awards points for decreased phone usage, and for one week after using the app. Stacy's
alternative hypothesis is He: x < 114.6.
Before 103 127 87 124 95 136 130
After 83 94 120 105 75 98 96
What is the difference in the sample means? Round to the nearest tenth of a minute.
difference in sample means =
minutes

step-by-step explanation:

yes.. it's proven to be 36.

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.