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3 years ago

1890s was rounded to the nearest 10 what is the upper bound

Mathematics

1 answer:

Ksivusya [100]3 years ago

3 0

Answer:

When rounding to the nearest ten, like we did with 1890 above, we use the following rules:

A) We round the number up to the nearest ten if the last digit in the number is 5, 6, 7, 8, or 9.

B) We round the number down to the nearest ten if the last digit in the number is 1, 2, 3, or 4.

C) If the last digit is 0, then we do not have to do any rounding, because it is already to the ten.

Step-by-step explanation:

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Bank of America's Consumer Spending Survey collected data on annual credit card charges in seven different categories of expendi

cupoosta [38]

Answer:

a) Null hypothesis: $\mu_d= 0$

Alternative hypothesis: $\mu_d \neq 0$

b) $t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{850 -0}{\frac{1123}{\sqrt{42}}}=4.905$

The next step is calculate the degrees of freedom given by:

$df=n-1=42-1=41$

Now we can calculate the p value, since we have a left tailed test the p value is given by:

$p_v =2*P(t_{(41)}>4.905) =0.000015$

So the p value is lower than any significance level given, so then we can conclude that we can reject the null hypothesis that the difference between he two groups are equal.

Step-by-step explanation:

Assuming the following questions:

We assume the following data: $n = 42 ,\bar d= 850 , s_d = 1123$

Previous concepts

A paired t-test is used to compare two population means where you have two samples in which observations in one sample can be paired with observations in the other sample. For example if we have Before-and-after observations (This problem) we can use it.

a. Formulate the null and alternative hypotheses to test for no difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out.

The system of hypothesis for this case are:

Null hypothesis: $\mu_2- \mu_1 = 0$

Alternative hypothesis: $\mu_2 -\mu_1 \neq 0$

Or equivalently

Null hypothesis: $\mu_d= 0$

Alternative hypothesis: $\mu_d \neq 0$

b. Use a .05 level of significance. Can you conclude that the population means differ? What is the p-value?

$t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{850 -0}{\frac{1123}{\sqrt{42}}}=4.905$

The next step is calculate the degrees of freedom given by:

$df=n-1=42-1=41$

Now we can calculate the p value, since we have a left tailed test the p value is given by:

$p_v =2*P(t_{(41)}>4.905) =0.000015$

So the p value is lower than any significance level given, so then we can conclude that we can reject the null hypothesis that the difference between he two groups are equal.

4 0

3 years ago

A movie theater sends out a coupon for 75% off the price of a ticket. Write an equation for the situation, where y is the pric

Fed [463]

Answer:

x divided by 75% = y

Step-by-step explanation:

3 0

3 years ago

camila is working two summer jobs,making $10 per hour lifeguarding and $6 per hour walking dogs. Camila worked 5 more hours life

lukranit [14]

Answer:

The number of hours she walked dogs for = 4 hours

The number of hours she worked as a life guard = 9 hours

Step-by-step explanation:

Here, the earning per hour as lifeguard = $ 10

The earning per hour for walking dogs = $ 6

Let us assume the number of hours she worked for walking dog = m hours

So, The hours she worked as life guard = (m + 5) hours

Also, earning of Camilla for walking dog for m hours = m x ( 1 hour income)

= m x ($6) = 6 m

Earning of Camilla for working as a guard for (m +5) hours

= (m +5 )x ( 1 hour income) = (m +5) x ($ 10)

= 10 m + 50

Now, her TOTAL EARNING = $114

⇒ Earning from walking dogs + Life guard = $114

⇒ 6 m + 10 m + 50 = 114

or, 1 6 m = 64

or, m = 64/16 = 4

or, m = 4 hours

Hence, the number of hours she walked dogs for = 4 hours

The number of hours she worked as a life guard = 5 +4 = 9 hours

7 0

4 years ago

Two trains leave a city at 3 P.M. One train goes east at a constant rate of 70 mph. The other goes west at a rate of 62 mph. How

andrey2020 [161]

Answer:

4 hours

Step-by-step explanation:

The general formula for distance, rate and time is:

d = rt, where distance is the product of rate multiplied by time

Given that one train is moving at a rate of 70 mph and one is moving at a rate of 62 mph in the opposite direction, the combined distance over time is equal to 528 miles. Using the variable 't' for time:

70t + 62t = 528

Combine like terms: 132t = 528

Divide both sides by 132: 132t/132 = 528/132 or t = 4 hours

8 0

3 years ago

Read 2 more answers

16 n + 18<br> can yall help me, please

andreev551 [17]

Answer:

With this i am really sure that you just need to add 16 and 18 and put n at the side of your final number sense x or anything else is shown in the mathamatical sentence

Step-by-step explanation:

3 0

4 years ago

1890s was rounded to the nearest 10 what is the upper bound ​

1890s was rounded to the nearest 10 what is the upper bound