Please help me with 1-4
1 answer:
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Answer:
The time taken by both when they work together is 2 hours 42 minutes .
Step-by-step explanation:
Given as :
The time taken by Ryan to dig 10 ft by 10 ft hole = x = 5 hours
The time taken bu Castel to dig 10 ft by 10 ft hole = y = 6 hours
Let The time taken by both when they work together = z hours
<u>According to question</u>
The time taken by both when they work together = time taken by Ryan to dig 10 ft by 10 ft hole + time taken bu Castel to dig 10 ft by 10 ft hole
i.e =
+
Or, =
+
<u>Taking LCM</u>
Or, =
Or, =
Or, z = hours
∴ z = 2 hours 42 minutes
So, The time taken by both when they work together = z = 2 hours 42 min
Hence, The time taken by both when they work together is 2 hours 42 minutes . Answer
Answer:
50
Step-by-step explanation:
Level of significance, a = 0.01
Type II error probability, b =0.05
From the z-table:
the critical value at 1% level of significance, Zα = Z0.01 = 2.33
the critical value at 5% probability, Zβ = Z0.05 = 1.645
The critical value of z can be obtained from the standard normal table using the desired level of significance and the tail of test.
The critical value tells the number of standards deviations away is the result from the mean.
Probability of type I error denoted by a
Probability of type II error denoted by b.
Type I error is to falsely infer the existence of something that is not there, while a type II error is to falsely infer the absence of something that is.
From the given information,
a=0.01, b=0.05, o1 = o2 =0.05, Dο = 0, D' = 0.04
The sample size is calculated as,
n =
=
= 49.38
which is 50 [Rounded to next integer]