Question

In: Statistics and Probability

Eight different families are tested for the number gallons of water a day they use before...

Eight different families are tested for the number gallons of water a day they use before and after viewing a conservation video. Information is given below. Do you believe that the conservation video is helpful to save daily water usage? Explain your answer using both confidence interval method and hypothesis test method.

before

34

33

38

33

40

31

33

35

after

33

28

25

35

31

28

35

28

Expert Solution

according to hypothesis testing methods null hypothesis is not rejected it means that there is not sufficient evidence that mean difference has decreased.in other words we can say that there is not sufficient evidence to say that conservation video is helpful to save daily water usage.

and confidence interval also contains positive values. so we cannot say that mean difference has decreased or there is not sufficient evidence to conclude that conservation video is helpful to save daily water usage.

please like ??

orchestra answered 2 years ago

Ten different families are tested for the number of gallons of water a day they use...

Ten different families are tested for the number of gallons of water a day they use before and after viewing a conservation video. At the 0.05 significance level, test the claim that the mean is the same before and after the viewing. List the null and alternative hypothesis, the critical value, the test statistic with and sd. Draw the graph and label the test statistic, critical value and rejection regions. Reject or fail to reject? State the conclusion Before 33...

Suppose that the number of gallons of milk sold per day at a local supermarket are...

Suppose that the number of gallons of milk sold per day at a local supermarket are normally distributed with mean and standard deviation of 419.9 and 26.93, respectively. What is the probability that on a given day the supermarket will sell between 432 and 438 gallons of milk? Question 2 options: 1) We do not have enough information to calculate the value. 2) 0.0036 3) 0.2508 4) 0.6734 5) 0.0758 Suppose that the mean and standard deviation of the scores...

The number of gallons of paint that Home Depot sells in a given day is normally...

The number of gallons of paint that Home Depot sells in a given day is normally distributed with a mean of 197 gallons and a standard deviation of 45 gallons (I realize that the distribution is probably different for weekends compared to weekdays, but just assume everyday has the distribution). How many gallons of paint have to be sold in a given day in order for that day to be in the top 5% of the highest number of gallons...

The manager of Fish Haven wants a program that displays the number of gallons of water...

The manager of Fish Haven wants a program that displays the number of gallons of water a rectangular aquarium holds, given the aquarium’s length, width, and height measurements in inches. (Hint: There are 231 cubic inches in a gallon.)a.Using the chart shown earlier in Figure 4-12 as a guide, enter the input, processing, and output items, as well as the algorithm, in the first column. b.Desk-check the algorithm twice. For the first desk-check, use 20.5, 10.5, and 12.5 as the...

A municipal water treatment plant is designed to produce 20 million gallons per day (MGD) of...

A municipal water treatment plant is designed to produce 20 million gallons per day (MGD) of potable water. The plant treats surface water using coagulation followed by sedimentation, filtration, and chlorination. Although the water is hard, it is not presently softened. The water is coagulated using a 30 mg/L dosage of alum (aluminum sulfate, Al2(SO4)3•14.3H2O, MW = 600). This chemical reacts in water to form Al(OH)3 as follows: Al2(SO4)3 + 6HCO3- → 2Al(OH)3(s) + 3SO4-2 + 6CO2 How many mg/L...

following are two weekly forecasts made by two different methods for the number of gallons of...

following are two weekly forecasts made by two different methods for the number of gallons of gasoline, in thousands, demanded at a local gasoline station. Also shown are actual demand levels in thousands of gallons: Forecasts week Method 1 Method 2 Actual Demand 1 0.90 0.80 0.70 2 1.05 1.20 1.00 3 0.95 0.90 1.00 4 1.20 1.11 1.00 The MAD method 1 = ??? thousand gallons... 2. The absolute deviatin based on the forecast developed using Method 1 adds...

Ten different people take part in an exercise program. Their blood pressure is tested before and...

Ten different people take part in an exercise program. Their blood pressure is tested before and after the program. Use a 5% level of significance to determine whether the program helps reduce blood pressure. Before 135 145 126 138 150 131 147 160 140 137 After 132 140 126 132 145 135 144 150 135 135 Ho: H1: Statistic: Conclustion:

One proposal for treating water in developing country is for individual families to use a small,...

One proposal for treating water in developing country is for individual families to use a small, home made slow sand filter followed by storage of filtered water in a clear plastic bottle exposed to the sun for a day. Explain the purpose of the slow sand filter and the mechanism that disinfects the water. ( Please type the answers not hand writing )

1. (Data Below) Outside Magazine tested 9 different models of day hikers and backpacking boots. The...

1. (Data Below) Outside Magazine tested 9 different models of day hikers and backpacking boots. The following data show the upper support and price for each model tested. Upper support was measured using a rating from 1 to 5, with a rating of 1 denoting average upper support and a rating of 5 denoting excellent upper support. Use these data to develop an estimated regression equation to estimate the price of a day hiker and backpacking boot given the upper...

The analyst took four batches of water bottles at different times of the day and recorded...

The analyst took four batches of water bottles at different times of the day and recorded the average amount filled. Use the data set below to create the control chart indicated to check if the water filling process is in control. Create the control charts and answer the questions in Excel and upload the file. 1. Create the xbar control chart for this data set. Assume that σ = 0.75. Discuss why or why not the water filling process is...