End 18. A scale balanced with 1 blue x-block and 20 green
blocks on the left side and 40 green blocks on
the right side. A student bumped into the scale
and knocked some blocks off so that only 1 blue
green
blocks remained on the left
side. How many blocks do you need to remove
x-block and 3
from the right side to make the scale balance?

According to a research study, parents with young children slept 6.4 hours each night last year, on average. a random sample of 18 parents with young children was surveyed and the mean amount of time per night each parent slept was 6.8. this data has a sample standard deviation of 0.9. (assume that the scores are normally distributed.) researchers conduct a one-mean hypothesis at the 5% significance level, to test if the mean amount of time parents with young children sleep per night is greater than the mean amount of time last year. the null and alternative hypotheses are h0: μ=6.4 and ha: μ> 6.4, which is a right-tailed test. the test statistic is determined to be t0=1.89 using the partial t-table below, determine the critical value(s). if there is only one critical value, leave the second answer box blank.