At 7am the temperature was -4 degrees. by 3pm the temperature had gone up by 10 degrees. what was the temperature at 3am

Jennifer had $30 to spend on herself. She spent 1/5 of the money on a sandwhich, 1/6 for a ticket to a museum, and 1/2 of it on

Vinil7 [7]

Jennifer had $4 left. 1/5 of 30 is 6, 1/6 of 30 is 5 and 1/2 of it is 15. Add it together and you get 26. 30-26 is 4

6 0

3 years ago

Please help! see attached

nikdorinn [45]

Answer:

The lowest value of the confidence interval is 0.5262 or 52.62%
The highest value of the confidence interval is 0.5538 or 55.38%

Step-by-step explanation:

Here you estimate the proportion of people in the population that said did not have children under 18 living at home.It can also be given as a percentage.

The general expression to apply here is;

$C.I=p+-z*\sqrt{\frac{p(1-p)}{n} }$

where ;

p=sample proportion

n=sample size

z*=value of z* from the standard normal distribution for 95% confidence level

Given;

n=5000

Find p

From the question 54% of people chosen said they did not have children under 18 living at home

$\frac{54}{100} *5000 = 2700\\\\p=\frac{2700}{5000} =0.54$

To calculate the 95% confidence interval, follow the steps below;

Find the value of z* from the z*-value table

The value of z* from the table is 1.96

calculate the sample proportion p

The value of p=0.54 as calculated above

Find p(1-p)

$0.54(1-0.54)=0.2484$

Find p(1-p)/n

Divide the value of p(1-p) with the sample size, n

$\frac{0.2448}{5000} =0.00004968$

Find the square-root of p(1-p)/n

$=\sqrt{0.00004968} =0.007048$

Find the margin of error

Here multiply the square-root of p(1-p)/n by the z*

$=0.007048*1.96=0.0138$

The 95% confidence interval for the lower end value is p-margin of error

$=0.54-0.0138=0.5262$

The 95% confidence interval for the upper end value is p+margin of error

$0.54+0.0138=0.5538$

7 0

3 years ago

Read 2 more answers

A bank branch located in a commercial district of a city has the business objective of improving the process for serving custome

choli [55]

Answer:

We conclude that the mean waiting time is more than or equal to 5 minutes at 5% level of significance.

Step-by-step explanation:

We are given that waiting time is defined as the time the customer enters the line until he or she reaches the teller window.

A random sample of 15 customers is selected. Results found that the sample mean waiting time was 4.287 minutes with a sample standard deviation of 1.638 minutes.

Let $\mu$ = mean waiting time.

SO, Null Hypothesis, $H_0$ : $\mu$ $\geq$ 5 minutes {means that the mean waiting time is more than or equal to 5 minutes}

Alternate Hypothesis, $H_A$ : $\mu$ < 5 minutes {means that the mean waiting time is less than 5 minutes}

The test statistics that would be used here One-sample t-test statistics as we don't know about population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample mean waiting time = 4.287 minutes

s = sample standard deviation = 1.638 minutes

n = sample of customers = 15

So, the test statistics = $\frac{4.287 -5}{\frac{1.638}{\sqrt{15} } }$ ~ $t_1_4$

= -1.686

The value of t test statistics is -1.686.

Since, in the question we are not given the level of significance so we assume it to be 5%. Now, at 5% significance level the t table gives critical value of -1.761 at 14 degree of freedom for left-tailed test.

Since our test statistic is more than the critical value of t as -1.686 > -1.761, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region due to which we fail to reject our null hypothesis.

Therefore, we conclude that the mean waiting time is more than or equal to 5 minutes.

5 0

3 years ago

Challanges first nations in canada in 1800-1850's help plz

aliya0001 [1]

The First Nations, Métis, and Inuit peoples lost reserved land, medical care, hunting and fishing rights and other things after the prime minister Trudeau got rid of the department of Indian affairs.
There was experiments on some of the Indian people.
Native people served in wars for Canada but were ignored after the war.
Native people were treated as minority and were forced to get rid of cultural identity
There was the Indian Act, White paper was introduced, Residential schools were made for Native people, There was unsuitable reserve conditions, health problems, death and suicides, not many people got education or careers.
Hope this helps, brainliest answer?, and try posting math question in this category, thnx

6 0

3 years ago

NEED HELP ASAP!!!

sergiy2304 [10]

14. To get the length of each side, you will have to find the square root of 189 to find what two numbers multiplied by itself will get to that number. The square root of 189 is about 13.7, to the nearest tenths is 14

7 0

3 years ago