Acommuter has $245 in his commuter savings account. this account changes by -$15 each week he buys a ticket.

a- if the account changes by -$240, for how many weeks of tickets did the commuter buy?

b- if the commuter wants to buy 20 weeks of tickets, how much must he add to his accoumt?

Anull hypothesis states that the difference between 8 hours of sleep and 3 hours of sleep has no effect on the number of pictures a student will remember during a picture memory interface test (pmit). examining the mit database, an extremely small t-value of 0.1611 is found. this t-value is much smaller than the smallest t-value on the chart for p-value reference. from this information we can: select one: a. accept the null hypothesis because the p-value obtained shows that the difference between the two groups being tested is not statistically significant b. accept the null hypothesis because the p-value obtained was statistically significant c. reject the null hypothesis because of the p-value obtained d. reject the null hypothesis because the data obtained is statistically significant