The questions are in the photos below:

i would like to know if my answers are correct or not and I would like them solved too.

Question 9 Answer saved Marked out of 100 'F Flag question Use Excel to find the sample standard deviation, 5, for the following 7 sample values: 8.8 4 9.3 14.2 7.3 3.4 2.4 Question 16 Answer saved Marked out of 1.00 F Flag question If the centre of a sampling distribution is not located at the parameter it is estimating, then we call that sampling distribution Select one: Q a. unbiased O b. random 0 c. minimum variance 0 d. biased Clear my choice Question 12 Answer saved Marked out of 100 '(7 Flag question Consider the correlation r between two quantitative variables. What would a value of r = -1 indicate? Select the best answer from the list below: Select one: Q a. The correlation coefficient cannot be negative so this must be a mistake a b. Perfect negative correlation between the two variables 0 c. No correlation between the two variables 0 d. Very low correlation between the two variables Clear my choice Question 6 A study was recently done that emphasized the problem we all face with drinking and driving. Four hundred accidents that Answer saved occurred on a Saturday night were analyzed. Two variables noted were the number of vehicles involved and whether alcohol Marked out of played a role in the accident. The numbers are shown below: 1.00 Number of Vehicles Involved Flag Did Alcohol Play a Role? 7 2 3 or More Total question Yes 50 99 21 170 No 28 178 24 230 Total 78 277 45 400 What proportion of three or more vehicle accidents involve alcohol? Select one: O 0.124 (3dp) O 0.357 (3dp) 0 0.467 (3dp) O 0.641 (3dp) O 0.053 (3dp) O 0.582 (3dp) O 0.294 (3dp) Clear my choiceQuestion 15 Answer saved Marked out of 100 '7 Flag question A sample is a subset of a population from which the data are obtained. Select one: 0 True 0 False Question 14 Answer saved Marked out of 1.00 \\7 Flag question Claudia Taylor, Director of Global Industrial Sales in Melbourne, is concerned by a deteriorating sales trend. Specifically, the number of customers is stable at 1500 but they are purchasing less each year. She asks her staff to search for causes of the downward trend by selecting a focus group of 40 industrial customers. For this study, the set of 40 industrial customers is a Select one: 0 a. population 0 b. statistic O C. sample 0 d. parameter Clear my choice Question 5 Answer saved Marked out of 5.00 '7 Flag question It is well-known that lack of sleep impairs concentration and alertness, and a researcher suspects this might be partly due to late night food consumption. A 2015 study took 44 people aged 21 to 50 and gave them unlimited access to food and drink during the day, but allowed them only 4 hours of sleep per night for three consecutive nights. On the fourth night, all participants again had to stay up until 4 am, but this time participants were randomized into two groups; one group was only given access to water from 10 pm until their bedtime at 4 am while the other group still had unlimited access to food and drink for all hours. The group forced to fast from 10 pm performed significantly better on tests of reaction time and had fewer attention lapses than the group with access to late night food. (a) What are the cases in this study? 0 The 44 participants involved in the study (b) What is the explanatory variable? Whether or not the participants had unlimited access to food and beverages until 4am e (c) What is the response variable? The reaction times and number of attention lapses on the subsequent tests : (d) Does the researcher suspect causation? Yes : (e) As the group forced to fast from 10 pm performed significantly better on tests of reaction time and had fewer attention lapses than the group with access to late night food, might it be appropriate to conclude causation in this case? Yes, we could conclude causation in this case because it is an experimental study e Quesmn 2 The shelf life of bunches of bananas (the number of days until the bananas go bad) is measured for a large sample. Answer saved Marked out of 100 Is the following statement true or false? '(7 Flag The bunches of bananas are the cases for this study. question Select one: 0 True 0 False Question 11 If x = 50.1 and s = 5.9, find the z score of x = 59.1. Give your answer to 2 decimal places. Answer saved Marked out of 1.00 Answer: 1.53 Flag questionQuestion 19 To create a confidence interval from a bootstrap distribution using percentiles, we keep the middle values and chop off a Answer saved certain percent from each tail. Indicate what percent of values must be chopped off from each tail for a 90% confidence Marked out of interval: 5% + 1.00 Flag questionQuestion 8 Answer saved Marked out of 1.00 17 Flag question Find the mean of the following sample: 6.2 6.1 11 11.3 18.5 3.8 5.7