Isabella paid one of her bill late and owed a 4% late fee was 780. How much was Isabella's original bill in dollar

Let the following sample of 8 observations be drawn from a normal population with unknown mean and standard deviation: 22, 18, 1

BigorU [14]

Answer:

a: Sample mean: 20, Sample standard deviation: 1.732

b: 19.13 <µ < 20.87

c: 18.84< µ < 21.16

d: as the confidence level increases, the interval becomes wider

Step-by-step explanation:

a: Sample mean is found by adding up all the individual values of the sample, then dividing by the total number of values in the sample.

Sample standard deviation is the square root of the variance

See the first attached photo for the calculations of these values.

We need to create a 80% confidence interval for the population. Since n < 30, we will use a t-value with degree of freedom of 7 (the degree of freedom is always one less than the sample size.

Look for the column on the t-distribution chart that has "area in two tails" of 0.20 (80%), and row 7 (degree of freedom)

The t-value is 1.415

See the second attached photo for the construction of the confidence interval

We need to create a 90% confidence interval for the population. Since n < 30, we will use a t-value with degree of freedom of 7 (the degree of freedom is always one less than the sample size.

Look for the column on the t-distribution chart that has "area in two tails" of 0.10 (90%), and row 7 (degree of freedom)

The t-value is 1.895

See the third attached photo for the construction of the confidence interval

3 0

2 years ago

Given the following two solids. Complete the following prompts using complete sentences. Write a hypothesis that compares the vo

Bess [88]

Now, there are many types of solids. Hypothesis can be stated as there is a significant discrepancy between solid one from the other sold. Moreover, if the results seems to support the hypothesis then it is somehow reliable and accurate.Thank you for your question. Please don't hesitate to ask in Brainly your queries.

7 0

2 years ago

Read 2 more answers

3) George walks away from his house. He walks 25 km west and then

Romashka-Z-Leto [24]

Answer:

29.15 km

Step-by-step explanation:

Given;

George walks; 25km west and then 15 km south

Resolving the directions to x and y axis;

North and South represent positive and negative y axis.

East and West represent positive and negative x axis respectively.

25km west

Rx = -25 km

15 km south

Ry = -15 km

The resultant displacement from the house is;

R = √(Rx^2 + Ry^2)

Substituting the values;

R = √((-15)^2 + (-25)^2)

R = √(225+625)

R = √(850)

R = 29.15 km

Therefore, he is 29.15 km from house

8 0

2 years ago

PLEASE HELP! Taylor wants to make granola bars for her hiking club. The recipe calls for 3/4 of a cup of raisins for 2 batches o

xeze [42]

Answer:

I think it would be the 2 bathchrs go by div and turn to a simple form and then overdue it by its times and calculate I hope it helps you I'm very sorry if it doesn't

8 0

2 years ago

Tom and Rob are brothers who like to make bets about the outcomes of different contests between them. Before the last bet, the r

Natali [406]

After Rob has lost, he will have 120 dollars. We can work this out by establishing that if Rob had 280 dollars before the final competition, and the ration at the point was 4 to 7, then this means that Tom must have had 4/7 of what Rob had, so x=4/7 * 280, x = 4 x 40, x = 160. This means that Tom had 160 dollars and Rob had 280. Adding this together they have a combined 440 dollars, but the ratio is now 8:3. There are 11 parts to the ration, due to the fact that 8 and 3 is 11, so we need to work out one part of the ratio - 440 divided by 11 equals forty. This means that Tom has 8 multiplied by 40 (320 dollars) and Rob has 40 multiplied by 3, so 120 dollars.

3 0

2 years ago