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Sloan [31]
3 years ago
8

Can someone hlpe with questions A and/or B please

Mathematics
1 answer:
pickupchik [31]3 years ago
5 0
Let sample in Texas be p1, Louisiana be p2.
Null Hypothesis: 
p1 - p2 = 0
Alternative Hypothesis: (This represents the claim)
p1- p2 < 0

To calculate test statistic, you need the pooled estimate which is a weighted average of the 2 sample proportions.
P = \frac{n_1 p_1 + n_2 p_2}{n_1 + n_2} = \frac{2000(.179+.265)}{2000+2000} = 0.222
Next get standard error:
SE = \sqrt{P(1-P)(\frac{1}{n_1} + \frac{1}{n_2})} = \sqrt{.222(1-.222)(\frac{1}{2000}+\frac{1}{2000})} = 0.01314
Calculate test statistic:
Z = \frac{p_1 - p_2}{SE} = \frac{.179 - .256}{.01314} = -5.86
To find p-value, look up Z-value in standard normal table.
Anything smaller than -3 or larger than 3, you can estimate to have
p-value = 0.

If p-value < alpha, Reject Null Hypothesis.
For this example, 0 < 0.05, therefore reject null hypothesis.

There is evidence to support claim that proportion of smokers in Texas is LESS than Louisiana.
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Tamia watched 1 2 of a movie in the morning, and she watched some more at night. By the end of the day, she still had 1 3 of the
KonstantinChe [14]

Answer: Tamiya watched \dfrac16 of the movie at night.

Step-by-step explanation:

Let x = part of movie watched at night.

Given  : Tanya watched \dfrac12 of movie in the morning.

Part left to watch = \dfrac13

As per given, we have

\dfrac12+x+\dfrac13=1\\\\\Rightarrow\ x=1-\dfrac13-\dfrac12\\\\\Rightarrow\ x=\dfrac{6-2-3}{6}\\\\\Rightarrow\ x=\dfrac16

Hence, Tamiya watched \dfrac16 of the movie at night.

8 0
3 years ago
write an equation using "x" and then solve the equationThe library bought 115 new fictions, 38 non-fiction and x new reference b
oee [108]

Answer:X=21

Step-by-step explanation:

115+38+x = 174

153+ x= 174

X=174-153

X=21

3 0
2 years ago
Graph t &gt; -3 please!​
PolarNik [594]

Answer:

see below

Step-by-step explanation:

t> -3

There is an open circle at -3 since there is no equals sign

t is greater so the line goes to the right

4 0
3 years ago
Susan needs 228 ounces of fruit juice for a party. She is choosing between two brands of juice. She finds the unit rate of each
Sergio [31]

Answer:

"Brand A costs approximately $0.21 per ounce, and Brand B costs approximately $0.18 per ounce."

In order to find the rounded cost per one item (in this case, per one ounce) Susan needs to divide the total price between the number of units and after that, round the result obtained up to the nearest cent.

Therefore:

Brand A

2.55$/12 ounces= 0.2125 $/ounce

As the third decimal digit, 2, is closer to 0 than to 9, then we maintain the second decimal digit as 1.

The price per unit of brand A after rounding it up is 0.21 $ per ounce

Brand B

1.45$/8 ounces= 0.1812

As the third decimal digit, 1, is closer to 0 than to 9, then we maintain the second decimal digit as 8.

The price per unit of brand B after rounding it up is 0.18 $ per ounce

4 0
3 years ago
Espress the following in standard form 24.12<br><br><br>​
ANTONII [103]
Answer: 2412(-2)
(-2)- small numbers

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3 years ago
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