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For example, a sample size of 203 gives 90% power, at a 5% significance level, to detect a difference of 2.3 in breast cancer worry between two of the four groups.
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There was no significant difference in educational status, perceived level of risk or cancer worry between the two referral groups.
"That was all very encouraging, but I was worried that between four and five weeks later Mr Topping loved the business so much he had to be offered a whacking incentive to stay with the business and it seemed very odd.
"In which case, why are we so worried about a conversation between two Al Qaeda leaders?" The intercepted conversation in question was between Ayman al-Zawahri, who succeeded Osama bin Laden as the leader of Al Qaeda, and Nasser al-Wuhayshi, the leader of Al Qaeda in the Arabian Peninsula, based in Yemen.
And many House members worry they will have to choose between two powerful, politically generous sectors of the telecommunications industry: the regional Bells and AT&T, which is now heavily invested in cable but is also allied in this battle with the long-distance companies WorldCom and Sprint, which are competing with the Bells.
Mr. Schröder's position has angered Washington and caused a public spat between two close allies, worrying diplomats.
On the song, Ty croons about him juggling a relationship between two different women, and being worried about one of them finding out about the other.
And Dorsey also represents one thing that worries potential investors: A CEO who is splitting his time between two companies, in Dorsey's case Twitter and Square.
If you're in doubt and deciding between two articles of clothing, one that you're worried is slightly casual, and one that you're worried is overly formal, err on the side of formal.
Conversation between two men.
wedged between two stones.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com