I am having trouble solving these study questions I need help ASAP

A non-profit organization plans to hold a raffle to praise funds for its operations. A total of 1000 raffle tickets will be sold for $1.00 each. After all the tickets are sold, one ticket will be selected at random and its owner will receive $50.00. The expected value for the net gain for each ticket is -$0.95. What is the meaning of the expected value in this context? The ticket owners lose an average of $0.95 per raffle ticket. O The ticket owners lose an average of $0.05 per raffle ticket. O Each ticket owner will lose $0.95 per raffle ticket. O A ticket owner has a 95 percent chance of having a ticket that is not selected.A random sample of 50 students at a large high school resulted in a 95 percent condence interval for the mean number of hours of sleep per day of (6.73, 7.67). Which of the following statement best summarizes the meaning of this condence interval? 0 We are 95% condent that the interval from 6.73 to 7.67 actually contains the true population mean number of hours of sleep per day of all students at a large high school. 0 95% of the students in the survey reported sleeping between 6.73 and 7.67 hours per day. Q A student selected at random from this population sleeps between 6.73 and 7.67 hours per day for 95% of the time. Q 95% of the students in this high school sleep between 6.73 and 7.67 hours per day. A random sample of 432 voters revealed that 100 are in favor of a certain bond issue. A 95 percent confidence interval for the proportion of the population of voters who are in favor of the bond issue is 100 + 1.645 0.5 X 0.5 432 O 0.231 x 0.769 0.231 + 1.645 432 O 0.5 x 0.5 100 + 1.961 432 O 0.231 x 0.769 0.231 + 1.961 432A sample of 400 households is selected in LA county and several variables are recorded. Which of the following statement is correct? 0 Socioeconomic status (recorded as "low income, middle income", or "high income" is nominal level data. 0 The number of people living in a household is a discrete variable. 0 The primary language spoken in the household is ordinal level data. 0 Total household incomes (in $) is interval level data. The commuting time for a student to travel from home to a college campus is normally distributed with a mean of 30 minutes and a standard deviation of 5 minutes. If the student leaves home at 8:25 AM, what is the probability that the student will arrive at the college campus later than 9 AM? 0 0.32 o 0.50 O 0.16 O 0.84 A manufacturer claims that its Brand A battery lasts longer than its competitor's Brand B battery. Nine batteries of each brand are tested independently, and the hours of battery life are shown in the table below Brand A 88 85 80 81 72 90 85 85 84 Brand B 80 79 77 82 75 81 77 73 78 Provided that the assumptions for hypothesis testing are met, which of the following tests should be conduced to test the claim? O Two-Tailed, two samples t O One-Tailed (Left-Tailed or Right-Tailed), paired t One-Tailed (Left-Tailed or Right-Tailed), two samples t O Two-Tailed, paired tIf a student conducted a two-tailed hypothesis test on a set of data and obtained a negative test statistic with p-value=0.44 . If the student should have used left-tailed to test the same data, which of the following is true about the possible p-value(s) that the student should have obtained? O The only possible p-value is 0.22. O The only possible p-value is 0.44 O The only possible p-value is 0.88 O The possible p-values are 0.22 and 0.78Perchlorate is a chemical used in rocket fuel. People who live near a former rocket-testing site are concerned that perchlorate is presents in unsafe amounts in their drinking water. Drinking water is considered safe when the average level of perchlorate is 24.5 parts per billion (ppb) or less. A random sample of 28 water sources in this area produces a mean perchlorate measure of 25.3 ppb. Which of the following is an appropriate null hypothesis that addresses their concern? The following probability distribution refers to two characteristics: age and traffic violations: VIOLATIONS IN THE LAST 12 MONTHS AGE None One Two+ Under 18 23 12 05 18 or older 45 14 .01 The probability that a randomly selected resident had no traffic violations in the last 12 months given that he/she is 18 or older is: O 0.60 O 0.45 O 0.75 O 0.66