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lukranit [14]
3 years ago
13

A researcher reports survey results by stating that the standard error of the mean is 20. The population standard deviation is 5

00.
a. How large was the sample used in this survey?
b. What is the probability that the point estimate was within ±25 of the population mean?
Mathematics
1 answer:
Mekhanik [1.2K]3 years ago
5 0

multiply 20 by 500. it should help you with the problem.

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(365 days per yr Jonas practices guitar 1 hour a day for 2 years. Bradley practices the guitar 2 hours a day more than Jonas. Ho
siniylev [52]

Answer:

87,600 minutes

Step-by-step explanation:

Given that practice time by Jonas :

1 hour per day for 2 years :

Bradley practices : 2 hours a day more than Jonas,

How many more minutes does Bradley practice the guitar than Jonas over the course of 2 years

Number of days in a year = 365 days

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What is the equation of a line parallel to -x+3y=-6 that passes through 9,-1
Natali [406]

Answer:

{ \tt{ - x + 3y =  - 6}} \\ { \tt{3y = x - 6}} \\ { \tt{y =  \frac{1}{3}x - 2 }}

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→ m = ⅓

• From general equation of a line;

→ \: { \tt{y = mx + c}} \\

• For the point (9, -1):

→ \: { \tt{ - 1 = (9 \times  \frac{1}{3} ) + c}} \\  \\→ \:  { \tt{ - 1 = 3 + c}} \\  \\ → \: { \tt{c =  - 4}}

therefore:

→ \: { \boxed{ \tt{y =  \frac{1}{3}x - 4 }}}

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Step-by-step explanation:

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